错题集
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四年级上册数学错题集一、大数的认识1. 题目:读数:300005000,错误答案:三亿零五千。
解析:读这个数时,从高位读起,亿级是3,读作三亿;万级都是0,只读一个零;个级是5000,读作五千。
正确答案应该是三亿零五千。
这里容易出错的地方在于万级的0的读法,每级末尾不管有几个0都不读,其他数位上有一个0或连续几个0,都只读一个零。
2. 题目:写数:三十亿零三百,错误答案:300000300。
解析:三十亿零三百,十亿位是3,百位是3,其他数位是0,正确写法应该是3000000300。
错误原因是没有正确理解每个数位上的数字,导致少写了0。
二、公顷和平方千米1. 题目:1公顷 =()平方米,错误答案:100。
解析:因为1公顷是边长为100米的正方形的面积,根据正方形面积 = 边长×边长,100×100 = 10000平方米,所以1公顷 = 10000平方米。
这里错误是对公顷和平方米的换算关系没有牢记。
2. 题目:一个长方形果园长500米,宽200米,这个果园的面积是多少公顷?错误答案:直接用500×200 = 100000(平方米),回答100000公顷。
解析:首先算出果园面积为500×200 = 100000平方米,然后将平方米换算成公顷,因为1公顷 = 10000平方米,所以100000平方米=10公顷。
错误在于没有进行单位换算。
三、角的度量1. 题目:用量角器量角时,角的一边与量角器内圈0°刻度线重合,另一边指向120°,这个角是()度,错误答案:120°。
解析:当角的一边与量角器内圈0°刻度线重合时,另一边指向120°,这个角应该是60°。
因为内圈刻度是按照逆时针方向读数的,而我们通常用量角器量角时,按照顺时针方向读数是外圈刻度,这里容易混淆内圈和外圈刻度的读数方法。
2. 题目:一个平角分成两个角,其中一个角是锐角,另一个角是()角,错误答案:锐角。
禁止机动车通行:表示禁止某种机动车通行。
此标志设在禁止机动车通行的路段入口处。
不要被标志下边的学校误导,题目问的是标志的意思,警告标志注意儿童,用以警告车辆驾驶人减速慢行,注意儿童。
设在小学、幼儿园、少年宫等儿童经常出入地点前适当位置。
很形象的追尾事故现场,警告标志事故易发路段,此标志设在交通事故易发路段以前适当位置。
靠左侧道路行驶,表示只准一切车辆靠左侧道路行驶。
此标志设在车辆必须靠左侧行驶的路口以前适当位置。
此标志为错车道,指示前方设有避让来车的处所。
指示高速公路两个行驶方向的目的地。
此标志是救援电话,用于指示救援电话号码。
紧急电话只有一个电话,没有其他字样。
可变车道的指示,是对应红绿灯的指示这么长的简易停车应该是公交车专用停车下客上车的,小车不能在此停车。
虚线短时停车,实线长时停车。
题干已经提示是虚线,所以题目描述错误。
6/170. 驾驶机动车遇到这种特殊情况怎样行驶?A. 靠右侧减速让行B. 保持原行驶路线C. 靠左侧减速让行D. 加速靠左侧让行校车在同方向只有一条机动车道的道路上停靠时,后方车辆应当停车等待,不得超越。
校车在同方向有两条以上机动车道的道路上停靠时,校车停靠车道后方和相邻机动车道上的机动车应当停车等待,其他机动车道上的机动车应当减速通过。
校车后方停车等待的机动车不得鸣喇叭或者使用灯光催促校车。
39/170. 驾驶机动车遇到校车在道路右侧停车上下学生时,应注意什么?A. 同向只有一条机动车道,后方机动车应当停车等待B. 同向有三条机动车道,中间车道后方机动车应当停车等待C. 同向有三条机动车道,左侧车道后方机动车可以减速通过64/170. 关于超车,以下说法正确的是什么?A. 完成超车后并回行车道要开启右转向灯B. 长时间鸣喇叭警示被超车辆驾驶人C. 超车前提前开启左转向灯,提醒前方被超车辆驾驶人D. 切换远、近光灯提醒前方被超车辆驾驶人68/170. 如图所示,驾驶机动车遇到这种情况时,以下做法正确的是什么?A. 放慢车速,缓缓绕过B. 鸣喇叭示意该车让路C. 保持原车速绕行D. 立即停车等待,直至该车离开模拟考试>科目四>章节练习69/170. 如图所示,驾驶机动车遇到这种情况时,以下做法正确的是什么?A. 鸣喇叭驱赶动物B. 与动物保持较远距离C. 下车驱赶动物D. 停车等待动物穿过71/170. 如何为特种车辆让路?A. 向前车鸣喇叭,自己在特种车辆前开路B. 向左减速让路,直到紧急车辆过去C. 立即停车,即使你在交叉口也是如此D. 向右减速让路,直到紧急车辆过去74/170. 驾驶汽车频繁变更车道的危害以下选项错误的是?A. 影响正常通行B. 易引发交通事故C. 易导致爆胎D. 扰乱交通秩序80/170. 驾驶机动车在下坡行驶过程中行车制动器失效,以下做法正确的是什么?A. 驶入紧急避险车道B. 使用发动机制动C. 使用驻车制动器制动D. 必要时,可用车体刮擦路边障碍物减速102/170. 驾驶机动车行经驼峰桥会车时,以下做法正确的是什么?A. 抢行通过B. 靠右通行C. 鸣喇叭示意D. 降低车速117/170. 驾驶机动车在山区上坡路段行驶,以下做法正确的是什么?A. 时刻注意下行车辆B. 应尽量避免换挡C. 应尽量匀速前进D. 应选择高速挡118/170. 驾驶机动车在山区道路上坡路段接近坡顶时,超车存在风险,以下说法正确的是什么?A. 接近坡顶时视线受阻,无法观察对向来车情况B. 接近坡顶时车速较慢C. 接近坡顶时视线受阻,无法观察坡顶之后道路走向D. 接近坡顶时视线受阻,无法观察坡顶之后是否有障碍物120/170. 夜间驾驶机动车会车时,对方一直使用远光灯,以下做法正确的是什么?A. 不停变换远近光灯以及鸣喇叭提醒对方B. 降低车速,靠右行驶C. 视线适当右移,避免直视灯光D. 变换远光灯行驶129/170. 如图所示,驾驶机动车跟随前车右转弯时,应当注意的是什么?A. 前面的车可能停下B. 右侧视野盲区内可能有自行车直行C. 行人可能突然进入本车前的人行横道D. 直行的黄色车辆可能影响本车右转弯159/170. 如图所示,驾驶机动车遇到这种情形时,应减速在其后保持安全距离通过路口。
一判断对错1、线段是直的,可以量出它的长度。
()2、用一个三角尺的两个锐角拼出的角一定是直角。
()3、角的边变长了,角的大小并没有变。
()4、一副三角尺有两个三角尺。
()5、用一副三角尺可以拼出锐角、直角。
()6、用两副三角尺才能拼出直角和钝角。
()7、三角尺上的两个锐角拼成的角一定是钝角。
()二选一选1、5个1元的硬币大约厚()A. 1厘米B. 1米C. 5厘米2、下面的物体中()的高度接近1米。
A. 台灯B. 写字桌C. 教室的门3、两个乘数都是5,写成乘法算式是()A. 5×5B. 5+5C. 5×24、小房屋,真好看,彩旗挂了有三串,下面不能表示彩旗面数的是()。
A. 4个3B. 3个4C. 4×35、用这把尺子能测量长度()1cm568A. 1cm、5cm、6cm、8cmB. 4cm、5cm、7cmC. 1cm、4cm、5cm、7cmD . 1cm、2cm、3cm、4cm、5cm、7cm三填一填1、下面两个三角尺都有()直角,两个()角,其中右边的这个三角尺上两个锐角()。
2、在里填上合适的数,使得每条线上三个数的和都是50。
3、看图填空×=口诀:4、量一量,蜗牛从第1条线路爬()厘米就回到家。
如果从第2条路回家呢?12家5、数一数,算一算。
===()朵6、数一数,下图一共有()角。
7、地里一共有100个胡萝卜,小白兔第一次运回36个,第二次运回23个,小白兔一共运回了多少个胡萝卜?小白兔打算送给小灰兔50个胡萝卜,地里剩下的胡萝卜还够吗?。
一、选择题1. 错题:3 + 2 × 4 = 20正确答案:3 + 2 × 4 = 11错误原因:未正确运用乘法优先级原则。
2. 错题:8 ÷ 2 + 2 = 7正确答案:8 ÷ 2 + 2 = 6错误原因:未正确运用除法和加法的顺序。
3. 错题:5 × (3 + 2) = 25正确答案:5 × (3 + 2) = 25错误原因:题目本身正确,但误以为题目有误。
4. 错题:0.5 × 0.5 = 0.25正确答案:0.5 × 0.5 = 0.25错误原因:题目本身正确,但误以为题目有误。
5. 错题:(-2) × (-3) = 6正确答案:(-2) × (-3) = 6错误原因:题目本身正确,但误以为题目有误。
二、填空题1. 错题:一个数的3倍加上4等于24,这个数是()正确答案:8错误原因:未正确运用代数方法解方程。
2. 错题:如果a = 5,那么a - 2 =()正确答案:3错误原因:未正确进行变量替换。
3. 错题:一个长方形的长是6厘米,宽是3厘米,它的面积是()正确答案:18平方厘米错误原因:未正确运用长方形面积公式。
4. 错题:一个数的平方根是5,那么这个数是()正确答案:±5错误原因:未考虑平方根的正负。
5. 错题:一个数的倒数是2,那么这个数是()正确答案:1/2错误原因:未正确理解倒数的概念。
三、解答题1. 错题:解方程:2x - 5 = 11正确答案:x = 8错误原因:未正确运用等式性质解方程。
2. 错题:计算:(-3) × 4 + 2 × (-5)正确答案:-14错误原因:未正确运用有理数混合运算规则。
3. 错题:求长方体的体积,长是8厘米,宽是4厘米,高是6厘米。
正确答案:192立方厘米错误原因:未正确运用长方体体积公式。
4. 错题:计算三角形面积,底是10厘米,高是6厘米。
34、点火开关在ON位置,车用电器不能使用。
ⅹ A、正确√ B、错误100、机动车仪表板上(如图所示)亮表示什么?ⅹ A、行车制动系统出现故障√ B、驻车制动器处于制动状态C、防抱死制动系统出现故障D、驻车制动器处于解除状态试题:造成交通事故后逃逸且构成犯罪的驾驶人,将吊销驾驶证且终生不得重新取得驾驶证。
答案:正确吊销机动车证的为二年,撤消机动车证的为三年,以醉酒吊销五年,因逃跑而吊销是终身,叫“吊二撤三醉五逃终身”试题:在这条公路上行驶的最高速度不能超过多少?A.30公里/小时B.40公里/小时C.50公里/小时D.70公里/小时答案:D根据《安全法》第四十五条:……在没有限速标志、标线的道路上,机动车不得超过下列最高行驶速度:(一)没有道路中心线的道路,城市道路为每小时30公里,公路为每小时40公里;(二)同方向只有1条机动车道的道路,城市道路为每小时50公里,公路为每小时70公里。
图为公路,所以最高时速为70公里/每小时。
试题:在这条车道行驶的最低车速是多少?A.60公里/小时B.90公里/小时C.100公里/小时D.110公里/小时答案:C同方向有2条车道的,左侧车道的最低车速为每小时100公里;同方向有3条以上车道的,最左侧车道的最低车速为每小时110公里,中间车道的最低车速为每小时90公里。
试题:这个标志是何含义?A.高速公路特殊天气最高速度B.高速公路特殊天气建议速度C.高速公路特殊天气最低速度D.高速公路特殊天气平均速度答案:B黄数字限最高速度,白数字限最低速度,黑数字是建议速度试题:这个标志是何含义?A.交叉路口预告B.车道方向预告C.分道信息预告D.分岔处预告答案:A分向行驶车道边上是虚线,下面没有距离标志。
交叉路口标志就是这个。
是有距离数字的。
试题:这辆在高速公路上临时停放的故障车,警告标志应该设置在车后多远处?A.150米以外B.50~150米C.50~100米D.50米以内答案:A亲们注意了,高速公路是150米以外,道路是50--100米试题:驾驶机动车通过窄路、窄桥时,最高速度不能超过多少?A.60公里/小时B.50公里/小时C.40公里/小时D.30公里/小时答案:D凡是题目中没有说是在高速路上,而行驶有麻烦的都是选30公里,如果是高速路,题目中有“能见度小于200米”,答案就选60公里,同样的,看到“能见度小于100米”就选“40公里”,“能见度小于50米”就选“20公里”。
错题集错题集1、 一根绳子3折量一口井,佘出1/3米;如果4折去量又不足1/4,求绳长,井深各多少米?,求绳长,井深各多少米?2、 小冬的爷爷参加运动会登山比赛,小冬的爷爷参加运动会登山比赛,上山时平均每分钟走上山时平均每分钟走30米,15分钟到山顶,分钟到山顶,然后用然后用20分钟沿原路下山,问上山、下山平均每分钟走多少米?路下山,问上山、下山平均每分钟走多少米?3、 一袋大米已吃了的和剩下的比是5:3,已经吃了这袋大米的,已经吃了这袋大米的 ( )) 剩下的比吃了的少(剩下的比吃了的少( )%。
( )4、 有一个圆柱形水池,用一根长5米的竹竿竖直地插入水池中,在竹竿与水面的交接处标上记号A ,然后将竹竿倒过来,依照上述方法,再做记号B ,记号A 和B 之间的距离是竹竿长度的1/5,那么水池中水深多少米?水池中水深多少米?5、有两个完全相同的长方体恰好拼成一个正方体,有两个完全相同的长方体恰好拼成一个正方体,正方体的表面和是正方体的表面和是30平方厘米。
如果把这两个长方体改拼成一个大长方体,那么大长方体的表面积是(体改拼成一个大长方体,那么大长方体的表面积是( )平方厘米)平方厘米6、有一花坛,高0。
5米,底面是边长2.4米的正方形。
四周用砖砌成,厚度是0。
2米,中间填满土。
(1)花坛所占的空间有多大?(2)花坛里大约有多少立方米土?)花坛里大约有多少立方米土?7、小明看一本科普书,已看了全书的3/8,比余下的少36页,这本书一共多少页?页,这本书一共多少页?8、食堂有3吨大米,如果每天吃去1/14,( )天可以吃完。
)天可以吃完。
9、水结成冰后体积增加了1/9,冰融化成水后,体积减少(,冰融化成水后,体积减少( )10、体积是1立方米的正方体,可以截成(立方米的正方体,可以截成( )个棱长是1分米的正方体,这些正方体排成一行,成为一个长方体,这个长方体的长是(为一个长方体,这个长方体的长是( )11、一个长方体长16厘米,如果把它的长增加2厘米,那么表面积就增加30平方厘米。
初三错题集整理
错误题目:请问,菲律宾的首都是马尼拉吗?
参考内容:
菲律宾的首都确实是马尼拉。
马尼拉是菲律宾的政治、经济和文化中心,也是该国最大的城市。
它位于菲律宾主岛卢索恩省的西南部,处于马尼拉湾的东岸。
马尼拉是菲律宾的交通枢纽,拥有菲律宾最重要的深水港口。
这座城市有着悠久的历史和丰富多样的文化遗产,也是菲律宾的旅游目的地之一。
错误题目:请问,美国的首都是纽约吗?
参考内容:
不,美国的首都不是纽约。
美国的首都是华盛顿特区。
华盛顿特区位于美国东海岸,濒临美国大西洋沿岸,是美国的政治中心。
华盛顿特区是一个独立的特区,受美国联邦政府直接管辖。
这里有美国总统的办公室、国会大厦、最高法院及其他重要政府机构的所在地。
此外,华盛顿特区还拥有丰富的博物馆和文化遗产,是美国重要的旅游目的地之一。
错误题目:请问,巴黎是意大利的首都吗?
参考内容:
错误,巴黎并不是意大利的首都。
巴黎是法国的首都,位于法国中北部的塞纳河畔,是法国的政治、经济和文化中心。
巴黎是世界上最受欢迎的旅游城市之一,也是法国最大的城市。
它以美丽的文化景观、知名的博物馆和艺术品、世界级的购物场
所和精致的法国美食而闻名。
而意大利的首都是罗马,罗马是一个有着两千七百多年历史的古老城市,是古罗马帝国和文艺复兴时期的中心。
罗马也是世界上最重要的考古遗址之一,拥有众多的历史和文化遗产。
八年级上册数学错题八年级上册数学错题集一、三角形错题 1:一个三角形的两边长分别为 3 和 6,第三边长是方程x^2 10x + 21 = 0的根,则三角形的周长为()A. 12B. 16C. 12 或 16D. 不能确定解析:解方程x^2 10x + 21 = 0,即(x 3)(x 7) = 0,解得x = 3或x = 7。
当第三边长为 3 时,因为 3 + 3 = 6,不满足三角形两边之和大于第三边,所以舍去。
当第三边长为 7 时,三角形的周长为 3 + 6 + 7 = 16。
故选 B。
错题 2:在\triangle ABC中,\angle A = 50^{\circ},\angle B = \angle C,则\angle B的度数为()A. 65°B. 50°C. 80°D. 40°解析:因为\angle A + \angle B + \angle C = 180^{\circ},且\angle B = \angle C,所以\angle B = (180^{\circ}50^{\circ})÷ 2 = 65^{\circ}故选 A。
二、全等三角形错题 3:如图,已知AB = AD,那么添加下列一个条件后,仍无法判定\triangle ABC ≌ \triangle ADC的是()A. CB = CDB. ∠BAC = ∠DACC. ∠B = ∠D = 90°D.∠BCA = ∠DCA解析:A 选项,因为AB = AD,CB = CD,AC = AC,根据 SSS 可判定\triangle ABC ≌ \triangle ADC。
B 选项,因为AB = AD,∠BAC = ∠DAC,AC = AC,根据 SAS 可判定\triangle ABC ≌ \triangle ADC。
C 选项,因为AB = AD,∠B = ∠D = 90°,AC = AC,根据 HL 可判定\triangle ABC ≌ \triangle ADC。
1. He said it was impossible for ______ a mistake in a computer’s calculation, so we can relay on that.A. there beingB. there would beC. there to beD. there was2. There ought to be less anxiety over the perceived risk of mountain climbing than _____ in thepublic mind today.A. existsB. existC. existingD. to existing3. The law regards him as a criminal, _____ he friend or enemy.A. beB. beingC. wereD. are4. Advertising is distinguished from other forms of communication in _____ the advertiser pays for the messageto be delivered.A. thatB. whichC. spite of the fact thatD. what5. I was to have made a speech if _____.A. I was not called awayB. nobody would have called me awayC. I had not been called awayD. nobody called me away6. Fat cannot change into muscle _____ muscle changes into fat.A. any more thanB. no more thanC. no less thanD. much more than7. He’s _____ as a “bellyacher” ----he’s always complaining about something.A. who is knownB. whom is knownC. what is knownD. which is known8. Although they plant trees in this area every year, the lops of some hills are still _____.A. blankB. hollowC. vacantD. bare9. If it _____ too much trouble, I’d like a cup of coffee.A. hadn’t beenB. isn’tC. weren’tD. may not be10. Nobody came to see me when I was out, _____?A. did theyB. didn’t theyC. did sheD. did he11. My cousin Mary is often in a poisonous mood; I suppose it’s because she is _____ child.A. oneB. a uniqueC. a singleD. an only12. The two scholars worked at the task of writing a preface to the new dictionary for three hours _____ last night.A. at lengthB. in fullC. on endD. in time13. He promised to return the book the next day without _____.A. failB. defaultC. troubleD. failure14. The snow seems to have set _____ for the evening.A. uponB. inC. aboutD. down15. It’s a bad manners to _____ other people behind their backs.A. do upB. do byC. do away withD. do down16. Since I could not see anything through the microscope, _____ my careful adjustment, I gave up.A. for allB. above allC. after allD. in all17. _____ the severe cold, tourism was _____ full swing.A. Though … onB. Despite … onC. Though … inD. Despite … in18. “It appears that the discussion was friendly and fruitful.” means that _____.A. the discussion appears to be friendly and fruitfulB. the discussion appeared to be friendly and fruitfulC. the discussion appears to have been friendly and fruitfulD. the discussion appeared to being friendly and fruitful19. The government is committed to enforcing some of recommendations but others will be open to _____.A. argueB. debateC. contestD. dispute20. Somehow he _____ through his speech and sat down with great relief.A. fumblesB. tumblesC. stumblesD. rumbles21. This word, which is _____, should be replaced with another one which is more commonly used nowadays.A. absoluteB. abnormalC. obliviousD. obsolete22. This computer can _____ stored information in a matter of seconds.A. retainB. retakeC. retrieveD. retrace23. This is the fifth case of bird flu _____ in the city this month.A. when occurringB. occurringC. to occurD. occurred24. The following are all correct response to “I’m very pleased to meet you.” EXCEPTA. LikewiseB. Me tooC. So am ID. I’m very pleased to meet you too25. Thinking only about short-term interests is killing a _____ that lay golden eggs.A. henB. duckC. gooseD. turkey26. The Irvine group and their _____ are testing whether lasers do the job better.A. accomplicesB. collaboratorsC. confederatesD. partners27. Would you just _____ an eye over this letter before I put it in the post?A. castB. flingC. jerkD. toss28. If reading is to accomplish anything more than ____time, it must be active.A. wastingB. spendingC. passingD. idling29. I’d sooner you ____deliver the sofa tomorrow.A. didn’tB. shouldn’tC. wouldn’tD. mustn’t30. The title of the book was on the ____of my tongue, but I just could not think of it.A. endB. tipC. backD. point31. We know she was always as ____as her word, so we trusted her.A. goodB. honestC. faithfulD. true32. Noise pollution generally receives less attention than ____air pollution.A. doesB. it doesC. receivesD. it does over33. She is as ____as her mother is beautiful.A. plainB. commonC. dullD. humble34. His father had promised to buy him a computer ____he behaved himself.A. in caseB. whileC. afterD. provided35. Y ou must have seen the movie Enchanted last week, ____?A. mustn’t youB. haven’t youC. didn’t youD. don’t you36. Our factory is much more productive now. This year’s production is five times ___it was twenty years ago.A. whatB. thatC. thanD. as37. He rushed into the room, his face ______ with sweat.A. drippingB. drippedC. being drippedD. was dripping38. Fibers of hair and wool are not continuous and must normally be spun into thread _______woven into textile fabrics.A. as are theyB. when to beC. that they areD. if they are to be39. We tried to settle the problem with them as soon as possible, but they seemed to______ sincerity.A. lack ofB. be lack ofC. lack inD. be lacking in40. Oh, dear, I don’t feel very well. I think ______.A. I’ll faintB. I’m going to faintC. I’m faintingD. I’ve fainted41. _______ ghost exits in the world. That’s your illusion.A. No such a thing asB. No such a thing as aC. No such thing as aD. No such thing as42. If it _______ too much trouble, I’d love a cup of coffee.A. had n’t beenB. isn’tC. weren’tD. may not be43. If it _____ too much trouble, I'd love to have a cup of coffee.A. hadn't beenB. isn'tC. weren'tD. may not be44. I hope you_____ all the material before you make the final decision.A. will have readB. will readC. will be readingD. would have read45. He never hesitates to make _____criticisms_____ are considered helpful to others.A. so ...thatB. so...asC. such...thatD. such...as46. In the lecture _____ he will tell us something about modern English usage.A. followingB. followedC. to followD. being followed47. People usually judge a man by the _____ he keeps.A. companyB. companionC. companiesD. companionship48. _____ your instruction, I would never have known how to go about the work.A. If not forB. UnlessC. ExceptD. But for49. Y ou were permitted into the hall for the film, _____ you sat at the back.A. unlessB. providedC. thoughD. suppose50. I underwent an operation _____ an early recovery.A. in hopes ofB. in the hopes ofC. in hope ofD. with the hope of51. Always bear in mind that your own resolution to succeed is more important than _____ thing.A. anyB. otherC. other aD. any other52. She said she wouldn't call us the next day, _____ she?A. wouldB. wouldn'tC. didD. didn't53. The airline says that this route is no longer _____, so they’re going to discontinue it.A. economicalB. economicC. beneficentD. beneficial54. He has been given until noon today to ______ to the police.A. turn himself upB. turn himself onC. turn himself inD. turn himself55. Believe in me, this dress may be expensive but it’s worth it because it’ll give you a real ______ in theinterview.A. allowanceB. bonusC. edgeD. profit56. Martha’s got a job, or _____ she tells me.A. whichB. soC. asD. is57. Such people as ______ by him were professors of the university.A. they were recommendedB. that were recommendedC. were recommendedD. recommended58. At first Jim was not quite clear what he was going to do after university, but now he seems_____ on becominga computer programmer.A. fitB. setC. disposedD. decided59. After working for the form for 10 years, he finally ______ the rank of deputy director.A. achievedB. approachedC. attainedD. acquired60. I didn’t answer all the questions, if only I _____ all of them.A. had answeredB. could answerC. would answerD. could have answered61. It will rain, ______the barometer is falling.A. soB. forC. asD. since62. I wish to invite you to dinner tonight, ______I?A. shallB. mayC. don’tD. would63. I don’t think those curtains _______ very well with the wallpaper.A. suitB. goC. fitD. match64. He told me part of the story and that was _______.A. itB. thisC. soD. that65. Please ________ from smoking until the airplane is airborne.A. preventB. resistC. refrainD. restrain66. Attendances at basketball matches have _______ since the coming of television.A. dropped inB. dropped downC. dropped offD. dropped out67. Housewives who do not go out to work feel they are not working to their full _______.A. capacityB. strengthC. lengthD. charges68. Sharp ________ make short graces. So don’t laugh at those lesser beings that do not have enough to supportthemselves.A. headsB. feetC. fingersD. stomachs69. Western Nebraska generally receives less snow than _____ eastern Nebraska.A. inB. it receives inC. doesD. it dose in70. They brought the land with a _____ to building a new office block.A. purposeB. reasonC. viewD. goal71. The sight of the fruit salad made John’s mouth _____.A. wetB. oozeC. waterD. moisten72. The economists are not quite optimistic about the economic ______ for Europe.A. outlookB. look outC. foresightD. project73. That _____ the case, we have to make some changes in our plan.A. isB. wasC. beingD. has been74. It was requested that all of the equipment____in the agreed time.A. erectedB. would be erectedC. be erectedD. will be erected75. The man sitting opposite me smiled dreamily, as if____something pleasant in the past.A. to rememberB. rememberedC. having been rememberedD. remembering76. I____him the Christmas gift by mail because he came home during the Christmas holidays.A. ought to have sentB. couldn’t have sentC. must have sentD. needn’t have sent77. It turned out that the children were not____for the accident.A. to blameB. to be blamedC. to be blamingD. to have been blamed78. The desegregation was achieved through a number of struggles,____been mentioned in previous chapters.A. a few of whichB. a few of themC. a few of thoseD. a few of that79. Setting up a committee might be a way____the project more efficiently.A. to be doingB. doingC. to doD. being done80. It____to see so many children in that mountainous area cannot even afford elementary education.A. pains herB. makes her painC. is painingD. is pained81. Our boss, Mr. Thompson,____a raise in salary for ages, but nothing has happened yet.A. was promisingB. has been promisingC. promisedD. has promised82. He was determined to sail around the world____his illness and old age.A. givenB. althoughC. despiteD. in spite83. Even if his letter ____ tomorrow, it ____ too late to do anything.A. will arrive...isB. should arrive...wereC. arrives...will beD. arrives...would be84. We can hear ____ from the back of the room.A. just as goodB. just as easyC. just as wellD. easily as well85. ____ drills that have no real topic have to remain as they are.A. ManufactureB. ManipulativeC. ManipulateD.Manifest86. This book has been in the works so long that I have lost ____ of most of the sources found for me by the staffof the library.A. traceB. trailC. trackD. touch87. The elbows on your coat have worn thin, so I must ____ them.A. mendB. patchC. repairD. pitch88. ____ and wage increases have not kept in step.A. ProductionB. ProductC. ProduceD. Productivity89. People under stress have performed ____ feats of strength, like lifting an automobile off an accident victim.A. specificB. extraordinaryC. abruptD. abnormal90. Modern appliances ____ us from a good deal of household work. For instance, the dryer frees us from hangingthe laundry.A. escapeB. benefitC. liberateD. comfort91. The audience waited in ____ silence while their aged speaker searched among his note for the figures he couldnot remember.A. respectiveB. respectC. respectfulD. respectable92. The disappearance of her paper has never been ____.A. counted forB. looked upC. accounted forD. checked up93. When he was asked about the missing briefcase, the man ____ ever seeing it.A. refusedB. deniedC. opposedD. resisted94. Communication between a young couple is a(n) ____ business.A. sharpB. dreadfulC. intenseD. delicate95. After so many weeks without rain, the ground quickly ____ the little rain that fell last night.A. skippedB. soakedC. retrievedD. absorbed96. We’ll ____ you as soon as we have any further information.A. notifyB. signifyC. communicateD. impart97. The fox fell into the ____ the hunters had set forit.A. bushB. trapC. trickD. circle98. I don’t know you want to keep the letter. I’ve ____ it up.A. tornB. givenC. brokenD. disposed99. The old lady ____ and fell from the top of the stairs to the bottom.A. slidedB. SlippedC. SplitD. spilled100. Free medical treatment in this country covers sickness of mind as well as __ sickness.A normalB regularC averageD ordinary101. The scene is so beautiful that it __my power of description.A. ascendsB. descendsC.transcendsD. overtakes102. For years he struggled ______ as teachers, an agent and the president.A by turnB on the turnC out of turnD in turn103. In the museum, I saw a __ of an old warship.A miniatureB mineralC minimumD minister104. Sharp __make short graces. So don’t laugh at those lesser beings who do not have enough to support themselves.A. headsB. feetC. fingersD. stomachs105. He was a talented man, so his parents expected much of him. But unfortunately he failed his parents and he was behind _______.A. barsB. doorsC. windowsD. walls106. Tom _____ to New Y ork but he had something urgent to deal with.A. was goingB. was to goC. was to have goneD. is to go107. The _____ from the fire made the room warm and cozy.A. flickerB. glowC. flashD. glint108. The population of this city has _____ doubled in the past ten years.A. larger thanB. more thanC. as great asD. as many as109. The airplane ____ down at Cairo on its way to India.A. stayedB. visitedC. landedD. touched110. There was not a single reason _____ proved you were wrong.A. thatB. butC. whoD. as111. She speaks French fluently _____ she prefers to chatter in English.A. and yetB. and howC. but stillD. in spite of112. Since we are very happy with our modest salary, there is no need _____ so much money.A. to haveB. of havingC. in havingD. with having113. ______, I’ll marry him all the same.A. Was he rich or poorB. Whether rich or poorC. Were he rich or poorD. Be he rich or poor 114. It was _____ we had hoped.A. more a success thanB. a success more thanC. as much of a success asD. a success as much as 115. The economic recession has meant that job _____ is a rare thing.A. SecurityB. safetyC. protectionD. secureness116. If your car _____ any attention during the first 12 months,take it to an authorized dealer.A. shall needB. should needC. would needD. will need117. I think an afternoon in the open air will do us good, _____?A. doesn’t itB. do youC. don’t youD. does it118. The old woman would have been drowned _____ a passer-by dragged her out of the water.A. but forB. but thatC. withoutD. if119. The activities of each day, _____ visiting the famous places of interest or anticipating the traditional party of local people, went quite smoothly.A. it beingB. be itC. was itD. it was120. This sort of rude behavior in public hardly _____ a person in your position.A. becomesB. fitsC. supportsD. improves121.____ their terms, we would go bankrupt.A. If we acceptB. If we should acceptC. If we had acceptedD. If we are to accept122. He is quite worn out from years of hard work. He is not the man ____________he was 20 years ago.A. whichB. thatC. whoD. whom123. Even as a girl, __________to be her life, and theater audiences were to be her best teachers.A. performing by Melissa wereB. it was known that Melissa’s performanc es wereC. knowing that Melissa’s performances wereD. Melissa’s knew that performing was124. Agriculture is the country’s chief source of wealth, wheat _____ by far the biggest cereal crop.A. permitB. beenC. beD. being125. Time _____, the celebration will be held as scheduled.A. permitB. permittingC. permittedD. permits126. ______ you _____further problems with your printer, contact your dealer for advice.A. If, hadB. Have, hadC. Should, haveD. In case, had127. Y ou____ borrow my notes provided you take care of them, I told my friend.A. couldB. shouldC. mustD. can128. He is too shy to ask a stranger the time, _____speak to a room full of people.A. much moreB. much asC. still lessD. still as129. Any possible solution to the Irish question can only come ____ through dialogue.A. aboutB. acrossC. aroundD. at130. All the newspapers wanted to do was to photograph the police officers ____the demonstrators.A. keeping withB. tangling withC. adhering toD. devoting to131. Some men seek office, not to be useful to the state and the grassroots, but for the ____ and fishes.A. breadB. meatC. loavesD. foods132. Last year, I paid a three-day visit to the company as a visiting engineer, and was treated ____.A. suchB. like itC. as suchD. such as133. The juvenile delinquent was released in ____ of his good behavior.A. caseB. wayC. viewD. event134. The ____ crown jewels are kept in the Tower of London.A. valuedB. valuelessC. invaluableD. worthy135. The outline of the figure was barely _____ in the darkness.A .susceptible B. invisible C. perceptive D. perceptible136. As a ____ actor, he can perform, sing , dance and play several kinds of musical instruments.A. flexibleB. versatileC. sophisticatedD. productive137. Paul earns very little as a classical cellist, ____ his brother’s pop musicals have made millions.A. in contrast toB. compared withC. whereasD. though138. Although cats cannot see in complete darkness, their eyes are much more____ to light than are human eyes.A. glowingB. brilliantC. sensitiveD. gloomy139. It will be safer to walk the streets because people will not need to carry large amounts of cash; virtually all financial____ will be conducted by computer.A. transactionB. transmissionsC. transitionsD. transformation140. Which of the following sentences is INCORRECT?A. All his lectures are very interesting.B. Half their savings were gone.C. Many his friends came to the partyD. Both his sisters are nurses.141. Which of the following words can NOT be used to complete “We’ve seen the film_______”?A. beforeB. recentlyC. latelyD. yet142. In the face of unexpected difficulties, he demonstrated a latent for quick, ________action.A. determiningB. defensiveC. demandingD. decisive143. Because of the economic crisis, industrial output in the region remained__________.A. motionlessB. inactiveC. stagnantD. immobile144. The police had difficulty in _________ the fans from rushing on to the stage to take photos with the singer.A. limitingB. restrainingC. confiningD. restricting145. Joan is in the dorm, putting the final ________ to her speech.A. detailsB. remarksC. commentsD. touches146. For the advertised position, the company offers a (n) ________salary and benefits package.A. generousB. plentifulC. abundantD. sufficient147. The prospect of increased prices has already ________worries.A. provokedB. irritatedC. inspiredD. hoisted148.With the elevation of people’s standard of living, cosmetics ________favorite topic, especially among women.A. has becomeB. have becomeC. becomeD. becomes149. A new idea is first condemned as ridiculous, _____ dismiss as trivial, until finally it becomes what everybody knows.A. thenB. laterC. and thenD.after that150. I am only one ;but still I am one. I cannot do _______, but still I can do something, I will not refuse to do ______I can do.A. all, whatB. anything, somethingC. everything , thoseD. everything, the something151. In the sentence "It's no use waiting for her", the italicized phrase is ______________.A. the objectB. an adverbialC. a complementD. the subject152. Due to personality _______________, the two colleagues never got on well in work.A. contradictionB. conflictC. confrontationD. competition153. The company has capitalized _____ the error of judgment made by its business competitor.A. inB. overC. withD. on154. Tim has failed three courses this semester, so he will have to _____ them next semester.A. remakeB. repeatC. reapplyD. revise155. At first Jim was not quite clear what he was going to do after university, but now he seems _____ on becoming a computer programmer.A. fitB. setC. disposedD. decided156. Bus services between Town Centre and Newton Housing Estate will be _____ until the motorway is repaired.A. discontinuedB. suspendedC. haltedD. ceased157. According to the new tax law, any money earned over that level is taxed at the ______of59 percentA. ratioB. percentageC. proportionD. rate158. There are still many problems ahead of us, but by his time next year we can see light at the end of the _________.A. battleB. dayC. roadD. tunnel159. This spacious room is ________ furnished with just a few articles in it.A. lightlyB. sparselyC. hardlyD. rarely160. Men differ from animals ____ they can think and speak.A. for whichB. for thatC. in thatD. in which161. This company has now introduced a policy _pay rises are related to performance at work.A. whichB. whereC. whetherD. what1---5 CAAAC 6---10 ACDBA11---15 DCABD 16---20 ADCAC21---25 DCCCC 26---30 BACAB31---35 AAADC 36---40 AADDB41---45 CCBAD 46---50 CADBA51---55 DDBBC 56---60 BCBCA61---65 BBBDC66---70 CADCC71---75 CACCA76---80 DAACA81---85 BCCCB86---90 CBDBC90---95 CCBDD96---100 ABABD101---105 CDADA106---110 CBBDB111---115 AADCD116---120 BCBBA121---125 BBDDB126---130 CDCAB131---135 CCCCD136---140 BCADC141---145 DDCBD146---150 AAACD151---155 DBDBB156---160 BDDBA161 B。
协和版:测得一组资料,如身高或体重等,从统计上讲,算术均数与其标准差的大小无关在指定尿铅95%参考值范围时,宜采用界值为:<P95σ-X表示的含义是总体均数的标准误估计值两小样本均数比较时,若方差不齐,可选择t’检验区间-X ±1.96S-X可用来估计总体均数的95%的可信区间配对设计资料的t检验,其检验假设为差值的总体均数等于0成组设计两样本比较的t检验,其检验假设为两总体均数相等在完全随机设计的方差分析中,必然有SS总=SS组间+SS组内随机区组设计的方差分析中,V区组=V总-V处理-V误差随机区组设计要求区组内个体差异越小越好,区组间差异越大越好。
方差分析中,多个试验组与一个对照组均数的多重比较,宜采用q检验对于服从二项分布的率或百分比资料进行方差分析,可考虑进行平方根反正弦变换标化率不反映某现象发生的实际水平。
经调查甲乙两市的冠心病粗死亡率为45/10万,按标准人群年龄构成标化后,甲市为52/10万,乙市为40/10万,故可认为甲市年龄别人口构成较乙市年轻。
欲比较两工厂工人某职业病患病率的高低,需假设两厂该工种工人的工龄构成相同。
直接标准化法选择的标准是各年龄组标准人口构成比或各年龄组标准人口数。
计算动态数列指标可以是实际数、平均数、率、构成比HBsAg总体阳性率95%可信区间表示π一定时,随机抽取n相等的100个样本率,至少有95个推断正确。
总体率(1-α)可信区间指求得的区间包含总体率的可能性为(1-α)在率比较的假设检验中,由于观察单位数较小,得P>0.05,若适当增加样本观察单位数,可增大理论频数。
在配对设计差值的符号秩和检验中,绝对值等于3的差值有-3、-3、3、3。
如果它们的位次为4、5、6、7,则第2个-3的秩次应为-5.5配对比较的秩和检验,若检验假设H0成立,则正秩和与负秩和相差不会很大。
四组等级资料比较宜采用秩和检验。
某医师调查得10名女中学生体重X(kg)与肺活量Y(L),经直线回归分析知,b=0.0748,若t b>t0.05,8,按α=0.05水准,可认为肺活量随体重增加而增加。
高一12.某混合气体中可能含有Cl2、O2、SO2、NO、NO2中的两种或多种气体。
现将此无色透明的混合气体通过品红溶液后,品红溶液褪色,把剩余气体排入空气中,很快变为红棕色。
对于原混合气体成分的判断中正确的是()A.肯定有SO2和NO B.肯定只有NOC.可能有Cl2和O2D.肯定没有Cl2、NO2,可能有O2 18.(9分)在原子序数1—18号元素中:(用元素符号或化学式表示除(4)外)(1)与水反应最剧烈的金属是_______Na______。
(2)与水反应最剧烈的非金属单质是______F2_______。
(3)在室温下有颜色的气体单质是______Cl_______。
(4)在空气中容易自燃的单质名称是______白磷_______。
(5)除稀有气体外,原子半径最大的元素是___Na_____ 。
(6)原子半径最小的元素是____H_________。
(7)气态氢化物水溶液呈碱性的元素是____N_________。
(8)气态氢化物最稳定的化学式是_______HF______。
(9)最高价氧化物对应水化物的酸性最强的元素是_____Cl________。
12.下图为周期表中短周期的一部分。
已知a原子的最外层上的电子数目是次外层电子数目的一半,下列说法中不正确的是( )A.元素a的最高价氧化物的水化物的酸性比b弱B.元素a的原子半径比d的大C.元素a的单质在空气中燃烧会导致“温室效应”D.元素a单质是一种良好的半导体材料14.现有下列五个转化,其中不可能通过一步反应实现的是()①Na2O2→NaOH ②CuSO4→CuCl2③SiO2→H2SiO3④CuO→Cu(OH)2A.①③B.②④ C.③④ D.②③④15. A、B、C、D、E五种元素原子具有相同的电子层数,A、B的最高价氧化物对应的水化物水溶液呈碱性,且碱性B>A; C、D的最高价氧化物对应的水化物水溶液呈酸性,且酸性C>D;五种元素所形成的简单离子中,E的离子半径最小。
则它们的原子序数由大到小的顺序正确的是( )A.CDEABB.ECDABC.BAEDCD.BADCE17.下述实验能达到预期目的的是:( )20.核潜艇上的核反应堆内使用了液体铝合金(单质钠和单质铝熔合而成)作载热介质,有关说法不正确的是( )A .原子半径:Na >AlB .铝钠合金若投入一定水中可得无色溶液,则n (Al )≤ n (Na )C .铝钠合金投入到足量氯化铜溶液中,肯定有氢氧化铜沉淀也可能有铜析出 21.(7分)有一小块外表不规则且质地坚实的大理石(主要成分为碳酸钙)样品,设计一个简单易行的实验测定此样品的密度。
(1)将实验方案填入下表:(2)若第一步测得的数据为a ,第二步先后读取的两个数据分别为b 和c ,则样品的密度为 。
(用含a 、b 、c 的代数式表示)(2)c bg/cm 34.下列事故处理方法不正确的是( )A .碰翻酒精灯失火时,立即用湿布盖灭B .电线短路失火时,立即用泡沫灭火器灭火C .浓硫酸溅到皮肤上,立即用大量水冲洗,然后涂上稀碳酸氢钠溶液D .浓碱溅到眼睛里,立即用大量水冲洗,边洗边眨眼睛18.给出下列条件,无法确定该物质摩尔质量的是( )A .已知液体物质的质量和物质的量B .已知固体物质的体积和质量C .已知气体在标准状况时的密度D .已知物质一个分子的实际质量18.将V L(标准状况)氯化氢气体溶于0.2 L 水中,所得盐酸溶液的密度是a g/cm 3,则所得盐酸溶液的物质的量浓度(mol/L)为A.aV/(4480+36.5V) B.1000aV/(36.5V+4480)C.36.5V/22.4a(V+0.2) D.3650aV/(36.5V+4480)1.将a g CuO和b g Fe2O3粉末分别溶于相同体积的足量稀盐酸中,得到CuCl2和FeCl3溶液的物质的量浓度相等(忽略溶液体积的改变)。
则a与b的关系为()A.a=2b B.2a=b C.a=b D.无法确定2.(16分)右图为实验室某浓盐酸试剂瓶上的标签,试根据有关数据回答下列问题:(1)该浓盐酸中HCl的物质的量浓度为mol/L。
(2)取用任意体积的该盐酸溶液时,下列物理量中不随所取体积的多少而变化的是。
A.溶液中HCl的物质的量B.溶液的浓度C.溶液中Cl-的数目D.溶液的密度(3)某学生欲用上述浓盐酸和蒸馏水配制500 mL物质的量浓度为0.30 mol/L稀盐酸。
①该学生需要量取mL上述浓盐酸进行配制。
②配制时,其正确的操作顺序是(用字母表示,每个字母只能用一次) 。
A.用30 mL水洗涤烧杯2~3次,洗涤液均注入容量瓶,轻轻摇动容量瓶B.用量筒准确量取所需浓盐酸的体积,慢慢沿杯壁注入盛有少量水(约30 mL)的烧杯中,用玻璃棒慢慢搅动,使其混合均匀C.将已冷却的盐酸沿玻璃棒注入500 mL的容量瓶中D.将容量瓶的玻璃塞盖紧,颠倒摇匀E.改用胶头滴管加水,使溶液凹面恰好与刻度线相切F.继续往容量瓶内小心加水,直到液面接近刻度线1~2 cm处③在配制过程中,下列操作会使所配制的稀盐酸物质的量浓度偏高的是。
A.用量筒量取浓盐酸时俯视观察凹液面B.溶液注入容量瓶前没有恢复到室温就进行定容C.定容时仰视刻度线D.在配置前用已知浓度的稀盐酸润洗容量瓶(4)现将200 mL 0.30 mol/L的盐酸与50 mL 0.80 mol/L CaCl2溶液混合(体积变化忽略不计),所得溶液中Cl-的物质的量浓度是mol/L;向所得混合溶液中加入5.3 g Na2CO3固体,充分反应后,溶液中生成沉淀的质量有_________g。
(5)在标准状况下,将______________L HCl气体溶于1000 mL水中(水的密度为1 g/cm3),所得盐酸的密度为1.2 g/cm3,溶质质量分数为36.5% 。
(保留小数点后一位)2 (1)12(2分)(2)B D(2分)(3)①12.5(2分)②B C A F E D(2分)③B D(2分)(4)0.56(2分) 2.0 (2分)(5)352.8(2分)15.同温同压下,某容器充满O2重116 g,若充满CO2重122 g,现充满某气体重114 g,则某气体的分子量为()A.28 B.60 C.32 D.418.标准状况下,将V L气体(摩尔质量为M g/mol)溶于0.2L水中,所得溶液的密度是a g/cm3,则此溶液的物质的量浓度(mol/L)为()A.VaMV4480+B.1000VaMV4480+C.MV22.4(V0.2)a+D.100VaMMV4480+23. (3分) 把6molCu粉投入含8molHNO3和2molH2SO4的稀溶液中,则标准状况下放出的气体的物质的量为。
3molMgO (Al2O3):试剂,离子方程式;NaOH溶液,Al2 O3+ 2OH-==2AlO2-+ H2O17. 将某份铁铝合金样品均分为两份,一份加入足量盐酸,另一份加入足量NaOH溶液,同温同压下产生的气体体积比为3∶2,则样品中铁、铝物质的量之比为A.3∶2B.2∶1 C.3∶4 D.4∶320.美国“海狼”潜艇上的核反应堆内使用了液体铝钠合金(单质钠和单质铝熔合而成)作载热介质,有关说法不.正确的是A.金属活动性:Na>AlB.铝钠合金若投入一定量的水中可得无色澄清溶液,则n(Al)≤n(Na)C.铝钠合金投入到足量氯化铜溶液中,肯定有氢氧化铜沉淀也可能有铜析出D.若m g不同组成的铝钠合金投入足量盐酸中,放出的H2越多,则铝的质量分数越小下列说法正确的是()A.原子最外层电子数为2的元素一定处于周期表ⅡA族B .主族元素A 、B 能形成AB 2型化合物,则A 与B 的原子序数之差可能为2或5或8C .第三周期元素的离子半径从左到右逐渐减小D .第ⅦA 族元素的非金属性比第ⅥA 族元素的非金属性强H 2(g) + Br 2(g)=2HBr(g)是放热反应,已知键能:H —H a kJ/mol ,Br —Br b kJ/mol ,H —Br c kJ/mol 。
下列叙述正确的是( )A .1 mol H 2(g)和1 mol Br 2(g)的总能量低于2 mol HBr(g)总能量B .反应消耗1 mol H 2(g)和1 mol Br 2(g),释放的热能为(a +b -c )kJC .a + b <2cD .因为该反应是放热反应,故不必加热就能发生)将一定质量由Cu 和CuO 组成的固体粉末加入到100 mL 11 mol/L 的浓HNO 3中,充分反应后,固体溶解完全,收集到NO 、NO 2混合气体6.72 L (标准状况)。
若将该混合气体与2.24 L O 2(标准状况)混合并通入到足量水中,恰好生成HNO 3。
(1) NO 的体积是 L ,NO 2的体积是 L (标准状况)。
(2) 固体粉末中Cu 单质的质量是 g 。
(3) 向浓HNO 3反应后的溶液中加入4 mol/L 的NaOH 溶液,当Cu 2+恰好沉淀完时,需要NaOH 溶液的体积是 L 。
(1) 1.12 5.6 (各2分)(2) 12.8 (2分)(3) 0.2 (2分)7.如果a g 某气体中含有的分子数为b ,则c g 该气体在标准状况下的体积是 ( ) A.A aN bc 4.22 L B.AcN ab 4.22 C.A bN ac 4.22L D.AacN b 4.22 L。