状语从句
1．In my family,our kids aren’t allowed to play outside _____they finish their homework.
A. unless
B. if
C. as long as
D. each time
2．We’ll go hiking if it rain this weekend. A. isn’t B. don’t C. doesn’t D. won’t 3．Usually, we don’t know how important something is ________ we lose it.
A. or
B. until
C. if
D. after
4．--Do you think ___________ he has taken the bag?
--___________ I’m mistaken.
A. that; Until
B. whether; If
C. that; Unless
D. whether; Unless
5．They were afraid to complain about the noise ________ they didn’t want to make an enemy of their neighbors.
A. because
B. unless
C. though
D. when
6．You shouldn’t have too much junk food ________ it’s bad for your health.
A. so
B. but
C. though
D. because
7．__________ the girl is only ten years old, she can take care of her brother and cook meals every day.
A. If
B. Because
C. Although
D. As
8．You must leave here now ________ your mother can get some more rest.
A. became
B. though
C. so that
9．I am waiting for my friend. , I will go swimming alone. A. If he doesn’t come B. If he won’t come
C. If he hasn’t come
10．—I will do my best in the talent show ______ I may fail.— Wonderful! I will support you all the time.
A. when
B. until
C. unless
D. though
11．—Why do you like wearing this old sweater?
—I like wearing this old sweater it was made by grannny by hand .
A. because
B. so
C. but
D. and
12．I don’t know if I anyone at the party this evening. If I anyone, I will get nervous.
A. will know, won’t know
B. will know, don’t know
C. know, won’t know
D. know, don’t know 13．— Why do you like koalas? —．A．Because they’re cute B． I like them C． Thank you 14．Donald Trump will take office on January 20, 2017 _ Barack Obama leaves the White House.
A. until
B. unless
C. because
D. as soon as
15．______ this is your first visit to Shanghai, let me show you around the city.
A. Although
B. Since
C. Unless
D. When
参考答案
1．A
【来源】湖北省鄂州市四校2017届九年级下学期3月联考英语试卷
2．C
【来源】湖北省随州市2017年九年级英语中考模拟试卷
3．B
【来源】山东省临沂市临沂经济开发区2017届九年级中考一模（期中）英语试题
4．C
【来源】江苏省常州市2017届九年级下学期教学情况调研测试英语试题
5．A
【来源】2017届上海中考英语模拟卷
6．D
【来源】山东省济南市槐荫区2017届九年级第一次模拟考试英语试题
7．C
【来源】【全国百强校】吉林省实验中学2017届九年级第三次模拟考试英语试题8．C
【来源】黑龙江省牡丹江管理局北斗星协会2016届九年级中考二模英语试题9．A
【来源】黑龙江省牡丹江管理局北斗星协会2016届九年级中考二模英语试题10．D
【来源】[首发]江苏省苏州市高新区2017届九年级下学期第一次模拟考试英语试题
11．A
【来源】山东省济南市2017年初中综合素质测试模拟英语试题
12．B
【来源】2017届河北秦皇岛卢龙县九年级上期中考试英语试卷
13．A
【来源】2014年湖南省祁阳县初中学业考试水平考试模拟（5）英语试卷
14．D
【来源】【全国百强校】上海市华东师范大学第二附属中学2017届九年级下学期英语单元测试卷（2017.3.1）
15．B
【来源】上海市崇明县2015--2016学年度第一学期初三质量调研英语试卷
、最值 一、选择题 1.(2017·全国甲卷理科·T11)若x=-2是函数f(x)=(2x+ax-1)1x e-的极值点,则f(x)的极小值为() A.-1 B.-23 e- D.1 e- C.53 【命题意图】导数研究函数的单调性,极值与最值以及不等式的解法.通过求极小值意在考查学生单调性与导数的关系,以及运算能力. 【解析】选A.由题可得f'(x)=(2x+a)1x e-+(2x+ax-1)1x e-=[2x+(a+2)x+a-1]1x e-, 因为f'(-2)=0,所以a=-1,f(x)=(2x-x-1)1x e-,故f'(x)=(2x+x-2)1x e-, 令f'(x)>0,解得x<-2或x>1,所以f(x)在(-∞,-2)和(1,+∞)上单调递增,在(-2,1)上单调递减,所以f(x)极小值=f(1)=(1-1-1)11 e-=-1. 【方法技巧】求可导函数f(x)的极值的步骤 (1)确定函数的定义区间,求导数f'(x). (2)求f(x)的拐点,即求方程f'(x)=0的根. (3)利用f'(x)与f(x)随x的变化情况表,根据极值点左右两侧单调性的变化情况求极值. 2.(2017·浙江高考·T7)函数y=f(x)的导函数y=f'(x)的图象如图所示,则函数y=f(x)的图象可能是() 【解析】选D.由导函数的图象可知函数在(-∞,0)上是先减后增,在(0,+∞)上是先增后减再增,故选D.
3.(2017·山东高考文科·T10)若函数g(x)=e x f(x)(e=2.718 28…是自然对数的底数)在f(x)的定义域上单调递增,则称f(x)具有M性质,下列函数中具有M性质的是() A.f(x)=2-x B.f(x)=x2 C.f(x)=3-x D.f(x)=cosx 【命题意图】本题考查函数的单调性的判断及导数的应用,意在考查考生应用已有知识分析问题、解决问题的能力. 【解析】选A.A中,g(x)=e x2-x= 2x e?? ???,因为 2 e >1,所以g(x)单调递增,所以f(x)具有M性质, 满足题意,故选A; B中,g(x)=e x x2,则g'(x)=e x x(x+2),所以g(x)在(-2,0)上单调递减,所以f(x)不具有M性质,不满足题意; C中,g(x)=e x3-x= 3x e?? ???,因为0< 3 e <1,所以g(x)单调递减,所以f(x)不具有M性质,不满足题 意; D中,g(x)=e x cosx,则g'(x)=e x(cosx-sinx),所以g(x)在 5 , 44 ππ ?? ? ?? 上单调递减,所以f(x)不具 有M性质,不满足题意. 二、填空题 4.(2017·江苏高考·T11)已知函数f(x)=x3-2x+e x-错误!未找到引用源。,其中e是自然对数的底数,若f(a-1)+f(2a2)≤0,则实数a的取值范围是. 【命题意图】考查利用函数性质解不等式,如何利用函数的性质把不等式转化为f(g(x))>f(h(x))的形式,根据函数的单调性去掉“f”,转化为具体的不等式(组)是重点.突出考查考生的应变能力. 【解析】因为f'(x)=3x2-2+e x+e-x≥3x2-2+2错误!未找到引用源。≥0,所以函数f(x)在R上单调递增,因为f(-x)
时间状语从句 要点: 时间状语从句，由以下连词引导： when while as after before as soon as since till /until by the time 在时间状语从句中，要注意时态一致。一般情况下主句是将来时的时候，从句要用一般现在时。 当。。。的时候 mozart started writing music when he was four years old. (当)莫扎特的时候，开始写音乐作品。 当。。。时 he visited a lot of places while he was traveling.他在旅途中参观了许多地方。 在。。。的同时；一边。。。一边。。。 he smiled as he stood up.他一边站起来一边笑着。 在。。。之后 he left the classroom after he had finished his homework the other day. 前几天做完作业之后回的家。 在。。。之前 mr. brown had worked in a bank for a year before he came here. 布朗先生来这之前已经在一家银行里工作一年了。 soon as 一。。。就。。。(主将从现) we began to work as soon as we got there.我们一到那就开始工作。 i will write to you as soon as i get home.我一到家就给你写信。 自。。。以来到现在 表示自过去的一个起点时间到目前(说话时间)为止的一段持续时间。主句一般用现在完成时，从句用一般过去时。 mr green has taught in that school since he came to china three years ago. 自格林先生来中国以来，他就在这所学校教书。 (还可以用作介词，本句从句还可以用短语：since three years ago(自三年前以来)表示。) 8 till /until都可以作连词，连接时间状语，也可以作介词，与其它词构成介词短语，在句中作状语。 they walked till /until it was dark.他们一直走到天黑。 xiao ming didn’t leave home till / until his father came back.小明直到他爸爸回来才离开家。 9. by the time 到。。。为止 (所在句子的主句应用完成时) by the time he gets there , his father has already gone.他到家的时候，他爸爸已经走了。 by the time i got to school, the class had already began.我到校时，已经开始上课了。 难点——as when while的辨析 as when while都表示主、从句动作同时发生，三者差异如下： as 表示“一边。。。一边＂的意思 强调两个动作同时进行，并表示对比时 when 1、还可以表示从句动词的动作在主几句动词的动作＂之前＂或＂之后＂发生。 2、when＝and then; at that moment (正在那个时候)
高考英语新状语从句知识点真题汇编附答案(1) 一、选择题 1．The sales of houses in our city fell by 40 percent last month, and it will be 48 percent ______ we don’t count low-price houses provided for poor residents. A．as B．unless C．if D．before 2．______ the environmental impacts of larger plastics are well documented, very little is understood about the dangers associated with micro plastics. A．While B．As C．Because D．If 3．All bad things must come to________end, ________ terrible an experience is. A．the; whatever B．an; however C．/; how D．a; what 4．There are other languages that sound extremely different, ________ they’re conveying exactly the same meaning. A．as though B．even though C．so that D．in that 5．The basic model function of the hero seems to remain constant, ______ the precise qualities of hero may vary over time. A．in case B．as if C．so that D．even though 6．_____ I once made some mistakes, I won’t spend a moment of the future regretting what might have been. A．Until B．While C．Unless D．Because 7．Do not make complaints about being left out___you shy away from sharing your joys and sorrow with others. A．when B．unless C．once D．until 8．The young lady rushed into the room _____ she heard the noise. A．right away B．at once C．immediately D．at the moment 9．Under the regulation, restaurants and hotels shall stop offering throwaway items_______customers request them. A．since B．once C．unless D．until 10．______, his ideas was accepted by all the people at the meeting. A．Strange as might it sound B．As it might sound strange C．As strange it might sound D．Strange as it might sound 11．You should take control of your life _________ it is planning coursework or picking a major. A．whenever B．whether C．whatever D．no matter 12．Prince Harry and his wife, Meghan, will give up the name “royal” ____ they withdr aw from official duties and embrace new lives, the couple confirmed on Friday. A．unless B．while C．as D．although 13．_____I had more money, I could buy a car. A．Only if B．If ever C．If only D．Even if 14．—Nowadays some parents keep their children under their wings. These helicopter parents even protect their children from the knowledge ________ they have failed. —Absolutely. They should know that setbacks and failures are part and parcel of adolescent growth.
专题07 平面向量的线性运算及其应用（高考押题） 2017年高考数学（理）考纲解读与热点难点突破 1．在平行四边形ABCD 中，AC 为一条对角线，AB →＝(2,4)，AC →＝(1,3)，则DA → ＝( ) A ．(2,4) B ．(3,5) C ．(1,1) D ．(－1，－1) 【答案】C 【解析】DA →＝CB →＝AB →－AC → ＝(2,4)－(1,3)＝(1,1)． 2．在等腰梯形ABCD 中，AB →＝－2CD →，M 为BC 的中点，则AM → ＝( ) A.12AB →＋12AD → B ．34AB →＋12AD → C.34AB →＋14AD → D.12AB →＋34AD → 【答案】B 【解析】因为AB →＝－2CD →，所以AB →＝2DC →.又M 是BC 的中点，所以AM →＝12(AB →＋AC → )＝12(AB →＋AD →＋DC →)＝12(AB →＋AD →＋12AB →)＝34AB →＋12AD → ，故选B. 3．已知向量BA →＝? ????1 2，32，BC →＝? ????32，12，则∠ABC ＝( ) A ．30° B ．45° C ．60° D ．120° 4．将OA →＝(1,1)绕原点O 逆时针方向旋转60°得到OB →，则OB → ＝( ) A.? ????1－32，1＋32 B.? ?? ?? 1＋32，1－32 C.? ????－1－32，－1＋32 D.? ?? ??－1＋32，－1－32 【答案】A 【解析】由题意可得OB → 的横坐标x ＝2cos(60°＋45°)＝2? ????24－64＝1－32， 纵坐标y ＝2sin(60°＋45°)＝2? ????64＋24＝1＋32，则OB →＝? ?? ?? 1－32，1＋32，故选A. 5．△ABC 外接圆的半径等于1，其圆心O 满足AO →＝12(AB →＋AC →)，|AO →|＝|AC →|，则向量BA →在BC → 方向上的投影等于( ) A ．－3 2 B ．32
中考复习专题状语从句知识点总结及经典习题(含答案) 一、初中英语状语从句 1． the journey was tiring，Jeff thought it was worth both the time and the money. A．As B．Since C．Unless D．Although 【答案】D 【解析】 【详解】 句意：虽然旅途很累，杰夫认为时间和金钱都值得。 A. As当……的时候； B. Since 自从； C. Unless除非； D. Although尽管。根据下文Jeff thought it was worth both the time and the money.可知上文是让步状语从句，这里用Although引导。根据题意，故选D。 2．--- I wonder if Tina to China next week. --- If it ，she will come. A．will come；won’t rain B．comes；doesn’t rain C．comes；won’t rain D．will come；doe sn’t rain 【答案】D 【解析】 【详解】 句意：——我想知道蒂娜下周是否会来中国。——如果不下雨，她就会来。根据语境推测对话的语境是“——我想知道蒂娜下周是否会来中国。——如果不下雨，她就会来。”，第一个设空处的if意思是“是否”，引导宾语从句，主句是一般现在时，从句根据时间状语next week确定用一般将来时，一般将来时的构成是：主语+will+动词原形，排除B/C；第二个设空处考查含有if引导的条件状语从句中主句的时态，在含有条件状语从句中的复合句中，时态遵循“主将从现”的原则，即：主句用一般将来时，从句使用一般现在时表将来，表示“不下雨”应借助于助动词does，故选D。 3．You are sure to fail the exam ________ you study hard. A．if B．unless C．since D．that 【答案】B 【解析】 试题分析：句意：如果你不努力学习，你一定会考试不及格的。A.if如果；B. unless如果不；C. since自从；结合句意，故选B。 考点：考查连词的用法。 4．--Where is the comic book? --I brought it to you ________you were in the reading room yesterday. A．when B．if C．because D．before 【答案】A
高考英语新状语从句知识点真题汇编含答案解析(2) 一、选择题 1．––Why does Jack Ma still work so hard he has already owned so much money? –– Maybe he pursues more than money. A．while B．as C．when D．before 2．______the damage is done, it will take many years for the farmland to recover. A．Until B．Unless C．Once D．Although 3．There are other languages that sound extremely different, ________ they’re conveying exactly the same meaning. A．as though B．even though C．so that D．in that 4．The basic model function of the hero seems to remain constant, ______ the precise qualities of hero may vary over time. A．in case B．as if C．so that D．even though 5．Believe it or not, some English idioms are very difficult to understand ______ you know the meaning of each word. A．as if B．in case C．now that D．even if 6．Just underwater grass floats on the surface if it loses its roots, a nation is lost without its memories. A．since B．while C．as D．when 7．House prices vary from place to place and are usually high ______ there are famous schools. A．where B．when C．which D．whether 8．The leaders of Catalonia said that he had decided to delay the declaration of independence ______ they could have a further negotiation with Spanish government. A．in case B．in order to C．so that D．not until 9．Under the regulation, restaurants and hotels shall stop offering throwaway items_______customers request them. A．since B．once C．unless D．until 10．_____ you feel that your friend is mean at times, cherishing your friendship is a normal part of life. A．Even though B．Now that C．As though D．In case 11．These masterpieces in the Louvre Museum reach out to us across the centuries ______ time itself were nothing. A．even if B．even though C．as though D．only if 12．—We have decided to go for a picnic tomorrow, Jack. Are you going with us? —Well, ______ you are going, so will I. A．when B．since C．if D．while 13．____ I look back to those days as a child, I really hope to spare more time to accompany my father.
2017年高考试题分类汇编（集合） 考点1 数集 考法1 交集 1.（2017·北京卷·理科1）若集合{}21A x x =-<<，{}13B x x x =<->或，则 A B = A. {}21x x -<<- B. {}23x x -<< C. {}11x x -<< D. {}13x x << 2.（2017·全国卷Ⅱ·理科2）设集合{}1,2,4A =，{}240B x x x m =-+=．若 {}1A B =，则B = A ．{}1,3- B ．{}1,0 C ．{}1,3 D ．{}1,5 3.（2017·全国卷Ⅲ·理科2）已知集合{}1,2,3,4A =，{}2,4,6,8B =，则A B 中元素的个数为 A.1 B.2 C.3 D.4 4.（2017·山东卷·理科1）设函数y =A ，函数ln(1)y x =-的定义域为B ，则A B = A ．(1,2) B ．(1,2] C ．(2,1)- D ．[2,1)- 5.（2017·山东卷·文科1）设集合{}11M x x =-<,{}2N x x =<,则M N = A.()1,1- B.()1,2- C.()0,2 D.()1,2 6.（2017·江苏卷）已知集合{}1,2A =，{}2,3B a a =+，若{}1A B =，则实数a 的值为______. 考法2 并集 1.（2017·全国卷Ⅱ·文科2）设集合{}{}123234A B ==，，， ，，， 则A B = A. {}123,4，， B. {}123，， C. {}234，， D. {}134，， 2.（2017·浙江卷1）已知集合{}11P x x =-<<,{}02Q x x =<<，那么P Q = A. (1,2)- B. (0,1) C.(1,0)- D. (1,2) 考法3 补集
中考英语状语从句考点归纳与例析 【重点讲解】 中考英语试题对状语从句的考查主要涉及引导状语从句的从属连词的用法。单项选择题的四个选项往往是四个连词，这是状语从句最常见的考查形式。另一个考点是状语从句中的时态，因此，在学习状语从句时要弄清状语从句的几个主要类别，如时间、地点、原因、条件、让步、方式、目的、结果等，同时记住它们的“引导词”及其相关意义。 考点一：引导状语从句的连词的选择。 1、引导时间状语从句的连词主要有when, while, as, by the time, before, after, since, till/until, as soon as等。其中when，while和as都可表示"当……时候"，但用法有区别: when意为"在……时;当……时",可表示"点时间"或"段时间",从句谓语可以是终止性动词,也可以是延续性动词。例如: When I got home, he was having supper. as意为"边……边……"或"与……同时",重在表示两个动作同时发生。伴随进行。as从句是终止性动词时,主句通常也必须是终止性动词。例如: They sang as they danced. while只可表示"段时间",从句谓语只限于延续性动词。例如: While I was sleeping, my father came in. 注意：从句谓语是持续性动词时,when，while和as可以互换。主、从句谓语都是终止性动词时，when与as可互换。从句谓语表示状态时，通常用while。 2、引导地点状语从句的常用连词是where。例如： Where there is a will there ia a way. 3、引导原因状语从句的连接词主要有because, as, since, for。例如： Tom was late for school this morning because he didn’t catch the early bus. As he was not well,I decided to go there without him. Since this method doesn't work, let's try another. for表示所说的理由是一种补充说明，因此, for引导的从句一般不放在句子的开头。例如: I decided to stop and have lunch, for I was feeling quite hungry. 注意：because语气最强，as, since, for次之。对于以why开头的问句，一般要用because引导的从句来回答。 4、引导条件状语从句的连接词主要有if, unless, as long as。例如： If I am not busy tomorrow, I will play football with you. Unless you tried it, you can’t imagine how pleasant it is. 5、引导让步状语从句的连接词有although, though, even if, even though。例如： Although (though) I gave him some advice, he didn’t take them.
专题十一状语从句 状语从句在高考试题中由于其他从句的干扰，以及倒装句，强调句的介入，使得状语从句更为复杂。状语从句是一种副词性从句，通常由一个从属连词或一个起连词作用的词组引导。状语从句 1. 时间状语从句 常见的连词(组)： when, while, as, before, after, once, till, until, as soon as, now that, hardly ...when, scarcely ...when, no sooner ...than等。 可以引导时间状语从句的副（介）词（短语）或名词短语： directly, instantly, immediately, by the time, the moment, the second, the minute, the instant, every time, each time, next time, the last time等。 注意点如下： (1) when, while, as引导的时间状语从句 as表示“当……的时候”，往往和when/ while通用，但它着重强调主句与从句的动作或事情同时或几乎同时发生。when(at or during the time)既可以表示在某一点的时候，又可以表示在某一段时间内，主句与从句的动作或事情可以同时发生也可以先后发生。while强调一段时间，仅表示从句和主句的动作同时发生，并且有延续意义，该从句中的动词一般要用延续性动词，从句中常用过去进行时态或一般过去时态；当when表示a period of time时，两者可以互换。 She came up as I was cooking.(同时) 在我做饭时，她走了过来。 When we were at school, we went to the library every day.(在一段时间内) 当我们在学校时，每天都去图书馆。 While they were watching TV, I was preparing myself for the coming examination. 他们在看电视，而我在为即将到来的考试做准备。 Strike while the iron is hot. 趁热打铁。( 不可用as或when，这里的while意思是“趁……”) (2) before引导状语从句时的常见重点句型 ①It will (not) be ...before ... 还要……才，要不了多久就…… It was (not) ...before ... 过了……才(没多久就……) It was a long time before I got to sleep. 过了好长时间我才睡着了。 It wasn t long before he told me about the news. 没多久他就告诉了我那条新闻。 ②不等……就……；在……之前就…… The telephone rang off before I could answer it. 我还没来得及接电话，电话就挂断了。 ③刚……就…… He hardly entered the room before he heard the telephone ring. 他刚进屋电话铃就响了。
高考英语专题状语从句知识点真题汇编及解析 一、选择题 1．Tom was so angry____ he heard his friend betrayed him____ he tore the letter into two immediately. A．that; when B．that; that C．when; what D．when; that 2．______ the environmental impacts of larger plastics are well documented, very little is understood about the dangers associated with micro plastics. A．While B．As C．Because D．If 3．Manchester United has decided that Wayne Rooney will not be sold to any other club no matter how much money is offered or ______ the potential risks of keeping an unhappy player. A．however B．whether C．what D．whatever 4．I will try my best to get lo the station ahead of time ____ I have to walk all the way there. A．so that B．as though C．even if D．in case 5．_____ I once made some mistakes, I won’t spend a moment of the future regretting what might have been. A．Until B．While C．Unless D．Because 6．Believe it or not, some English idioms are very difficult to understand ______ you know the meaning of each word. A．as if B．in case C．now that D．even if 7．House prices vary from place to place and are usually high ______ there are famous schools. A．where B．when C．which D．whether 8．The leaders of Catalonia said that he had decided to delay the declaration of independence ______ they could have a further negotiation with Spanish government. A．in case B．in order to C．so that D．not until 9．I was so proud _______ my team won the ice hockey competition. It made me feel like I could achieve anything. A．while B．when C．before D．until 10．_____ you may meet, you should face the challenge bravely. A．However a serious problem B．What a serious problem C．However serious a problem D．What serious a problem 11．Many countries have a Mother’s Day, ________ they don't always fall on the second Sunday in May. A．when B．though C．as D．once 12．—We have decided to go for a picnic tomorrow, Jack. Are you going with us? —Well, ______ you are going, so will I. A．when B．since C．if D．while 13．Peter had been puzzled over the problem for over an hour___________ all at once the solution flashed across his mind. A．when B．while C．then D．as 14．Elephants usually won’t attack a person ________ one becomes a danger to them. A．until B．although C．unless D．when
2017年高考试题分类汇编（数列） 考点1 等差数列 1.（2017·全国卷Ⅰ理科）记n S 为等差数列{}n a 的前n 项和．若4524a a +=， 648S =，则{}n a 的公差为 C A ．1 B ．2 C ．4 D ．8 2.（2017·全国卷Ⅱ理科）等差数列{}n a 的前n 项和为n S ，33a =，410S =，则 11n k k S ==∑ ． 21n n + 3.（2017·浙江）已知等差数列{}n a 的公差为d ,前n 项和为n S ,则“0d >”是 “465+2S S S >”的 C A.充分不必要条件 B.必要不充分条件 C.充分必要条件 D.既不充分也不必要条件 考点2等比数列 1.（2017·全国卷Ⅲ理科）设等比数列{}n a 满足121a a +=-,133a a -=-，则 4a =____．8- 2.（2017·江苏卷）等比数列{}n a 的各项均为实数，其前n 项的和为n S ，已知 374S = ,6634 S =，则8a = . 32 3.（2017·全国卷Ⅱ理科）我国古代数学名著《算法统宗》中有如下问题：“远 望巍巍塔七层，红光点点倍加增，共灯三百八十一，请问尖头几盏灯？”意思是： 一座7层塔共挂了381盏灯，且相邻两层中的下一层灯数是上一层灯数的2倍， 则塔的顶层共有灯 B A ．1盏 B ．3盏 C ．5盏 D ．9盏 考法3 等差数列与等比数列综合 1.（2017·全国卷Ⅲ理科）等差数列{}n a 的首项为1，公差不为0．若2a ，3a ， 6a 成等比数列，则{}n a 前6项的和为 A A ．24- B ．3- C ．3 D ．8
中考英语状语从句知识点总结及经典习题(含答案) 一、初中英语状语从句 1．We don't know the love of our parents _______ we become parents ourselves one day. A．until B．after C．when D．since 【答案】A 【解析】 句意：直到有一天我们成为父母，才知道父母的爱。本题考查连词。A. until到…为止，在…以前; 直到…才;B. after在…以后;C. when当···时候；D. since自从; 从…以来; Not until 直到···才···；不到···不···，是固定搭配，故选A。 2．I have to leave now __ I can catch the last bus. A．so that B．because of C．until D．as soon as 【答案】A 【解析】 试题分析：so that以便，所以；because of因为，由于；until直到；as soon as一……就……。句意：为了赶上末班车，我现在必须离开了。结合语境可知选A。 考点：连词辨析 点评：连词在句子中主要起联系上下文的作用，他们之间的区别就是表示逻辑关系的不同，所以在解题时先要理解上下文含义，然后根据上下文逻辑关系选择合适的连词。连词的用法都比较多，语义之间还有交叉，熟记其基本应用规则，了解其区别，注意固定搭配对象，是做好此类题型的关键。 3．---Would you like to go bike riding with us tomorrow? ---Sure, ____ I am busy. A．since B．unless C．when D．until 【答案】B 【解析】 试题分析：句意：----你想要明天和我们一起去划船吗？好的，如果我不忙我就去。A自从；B如果不；C当……时候；D直到……才。根据句意，应选B。 考点：考查连词。 4．You will fall behind others ______ you work hard. A．if B．unless C．though D．since 【答案】B 【解析】 试题分析：句意：如果你不努力学习，你会落后别人。A.because因为；B. If如果；C. Unless如果不； D. Though虽然。结合句意，故选B
高考英语状语从句知识点真题汇编及答案(1) 一、选择题 1．____ I look back to those days as a child, I really hope to spare more time to accompany my father. A．However B．Whenever C．Whatever D．Wherever 2．Why do many students stick to private tutoring _____ they could easily master such knowledge at school? A．unless B．before C．after D．when 3．______the damage is done, it will take many years for the farmland to recover. A．Until B．Unless C．Once D．Although 4．A Chinese company has created a new facial recognition system that can identify people ______ they are wearing masks. A．provided that B．in case C．as though D．even if 5．He differed _________ other people __________ he always looked further ahead in his work. A．from; in which B．from; in that C．with; in which D．with; in that 6．The basic model function of the hero seems to remain constant, ______ the precise qualities of hero may vary over time. A．in case B．as if C．so that D．even though 7．_____ I once made some mistakes, I won’t spend a moment of the future regretting what might have been. A．Until B．While C．Unless D．Because 8．House prices vary from place to place and are usually high ______ there are famous schools. A．where B．when C．which D．whether 9．The leaders of Catalonia said that he had decided to delay the declaration of independence ______ they could have a further negotiation with Spanish government. A．in case B．in order to C．so that D．not until 10．—Mr. Robert, I’d like to take a gap year to volunteer for a global anti-Aids campaign.—That’s great, ______ you can afford the time. A．provided that B．in case C．even if D．so that 11．I was so proud _______ my team won the ice hockey competition. It made me feel like I could achieve anything. A．while B．when C．before D．until 12．He hasn’t got any hobbies，________you call watching TV a hobby. A．when B．if C．unless D．since 13．Under the regulation, restaurants and hotels shall stop offering throwaway items_______customers request them. A．since B．once C．unless D．until