课堂练习10
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课堂10分钟练习(十六)——生物技术实践1.(2013·江苏高考)某研究性学习小组以樱桃番茄为材料进行果酒、果醋发酵实验。
下列相关叙述正确的是()A.酵母菌是嗜温菌,所以果酒发酵所需的最适温度较高B.先供氧进行果醋发酵,然后隔绝空气进行果酒发酵C.与人工接种的发酵相比,自然发酵获得的产品品质更好D.适当加大接种量可以提高发酵速率、抑制杂菌生长繁殖2.(2012·江苏高考)下列关于“DNA粗提取与鉴定实验”的叙述,正确的是()A.洗涤剂能瓦解细胞膜并增加DNA在NaCl溶液中的溶解度B.将DNA丝状物放入二苯胺试剂中沸水浴后冷却变蓝C.常温下菜花匀浆中有些酶类会影响DNA的提取D.用玻棒缓慢搅拌滤液会导致DNA获得量减少3.(2011·广东高考)以下关于猪血红蛋白提纯的描述,不.正确的是()A.洗涤红细胞时,使用生理盐水可防止红细胞破裂B.猪成熟红细胞中缺少细胞器和细胞核,提纯时杂蛋白较少C.血红蛋白的颜色可用于凝胶色谱法分离过程的监测D.在凝胶色谱法分离过程中,血红蛋白比分子量较小的杂蛋白移动慢4.右图是围绕加酶洗衣粉洗涤效果进行的研究结果,下列有关叙述不.正确的是()A.本实验的自变量有温度和洗衣粉是否加酶B.本实验的因变量可能是污渍残留量C.两类洗衣粉的最佳使用温度都为t1D.温度超过t2后加酶洗衣粉中的酶可能失活5.(2013·安徽高考)下图为通过DNA分子杂交鉴定含有某特定DNA的细菌克隆示意图。
下列叙述正确的是()A.根据培养皿中菌落数可以准确计算样品中含有的活菌实际数目B.外源DNA必须位于重组质粒的启动子和终止子之间才能进行复制C.重组质粒与探针能进行分子杂交是因为DNA分子脱氧核糖和磷酸交替连接D.放射自显影结果可以显示原培养皿中含有特定DNA的细菌菌落位置6.(2013·课标卷Ⅱ)临床使用抗生素前,有时需要做细菌耐药实验。
实验时,首先要从病人身上获取少量样本,然后按照一定的实验步骤操作,以确定某致病菌对不同抗生素的敏感性。
课堂10分钟练习(四)——光合作用和呼吸作用1.(2013·新课标卷Ⅱ)下列与微生物呼吸有关的叙述,错误的是()A.肺炎双球菌无线粒体,但能进行有氧呼吸B.与细菌呼吸有关的酶由拟核中的基因编码C.破伤风芽孢杆菌适宜生活在有氧的环境中D.有氧和无氧时,酵母菌呼吸作用产物不同2.(2013·新课标卷Ⅱ)关于叶绿素的叙述,错误的是()A.叶绿素a和叶绿素b都含有镁元素B.被叶绿素吸收的光可用于光合作用C.叶绿素a和叶绿素b在红光区的吸收峰值不同D.植物呈现绿色是由于叶绿素能有效地吸收绿光3.(2013·长沙模拟)光呼吸是指绿色植物在光照情况下,吸收O2而释放CO2的过程。
如下图所示为高浓度CO2环境中正常光合作用与高浓度O2环境中光呼吸的简要过程。
下列叙述正确的是()A.图中羧化反应和加氧反应的场所分别是叶绿体基质和细胞质基质B.光呼吸发生的条件有光照、高氧和低CO2等C.光呼吸与光合作用的中间产物都有C3、C2D.光呼吸能够产生CO2,而高浓度的CO2反过来抑制光呼吸,这是正反馈调节4.下图表示生物体内进行的能量释放、转移和利用过程。
下列有关叙述正确的是()A.a过程的完成一定伴随H2O和CO2的生成B.在人体剧烈运动过程中,肌肉细胞产生的A中不含有乳酸C.人体细胞中完成过程c的场所主要是线粒体D.人体内的a过程会受肾上腺素和甲状腺激素的影响5.(原创题)某研究小组在水肥充足条件下,观测了玉米光合速率等生理指标日变化趋势如下图。
据图判断下列有关叙述正确的是()A.光合作用消耗ATP最快的时刻是15:00B.根吸水能力最强的时刻是12:00C.直接引起蒸腾速率变化的生理指标是气孔阻抗D.影响光合速率的环境因素主要是CO2浓度6.(2013·福建高考)为研究淹水时KNO3对甜樱桃根呼吸的影响,设四组盆栽甜樱桃,其中一组淹入清水,其余三组分别淹入不同浓度的KNO3溶液,保持液面高出盆土表面,每天定时测定甜樱桃根有氧呼吸速率,结果如下图。
课堂10分钟练习(七)——遗传的基本规律和伴性遗传1.(2013·海南高考)对摩尔根等人得出“果蝇的白眼基因位于X染色体上”这一结论没有影响的是()A.孟德尔的遗传定律B.摩尔根的精巧实验设计C.萨顿提出的遗传的染色体假说D.克里克提出的中心法则2.(2013·新课标卷Ⅰ)若用玉米为实验材料验证孟德尔分离定律,下列因素对得出正确实验结论,影响最小的是()A.所选实验材料是否为纯合子B.所选相对性状的显隐性是否易于区分C.所选相对性状是否受一对等位基因控制D.是否严格遵守实验操作流程和统计分析方法3.(2013·山东高考)家猫体色由X染色体上一对等位基因B、b控制,只含基因B的个体为黑猫,只含基因b的个体为黄猫,其他个体为玳瑁猫。
下列说法正确的是() A.玳瑁猫互交的后代中有25%的雄性黄猫B.玳瑁猫与黄猫杂交后代中玳瑁猫占50%C.为持续高效地繁育玳瑁猫,应逐代淘汰其他体色的猫D.只有用黑猫和黄猫杂交,才能获得最大比例的玳瑁猫4.果蝇有两对常染色体上的基因控制的相对性状——翅型和体色,其中体色中黑体(A)对灰体(a)为显性,翅型中长翅(H)对残翅(h)为显性,环境中的某些因素会导致基因型为aaH_和A_hh的个体胚胎期死亡。
若纯合的雌虫(AAHH)与雄虫(aahh)交配,F1自交获得F2,则下列相关叙述中正确的是()A.F2群体中有5种基因型、2种表现型B.F2群体中能稳定遗传的个体占F2的比例为1/8C.F2群体中h的基因频率为60%D.F2群体中AAHH基因型的频率为1/95.(2013·广州模拟)下图为人类某伴性遗传病(隐性)的遗传系谱图。
若第二代中箭头标示的个体与一正常男性结婚,下列有关其所生子女的相关叙述中,不.正确的是()A.女孩一半为携带者B .所有女孩都正常C .所有男孩都会得此遗传病D .男孩得此遗传病的概率是1/26.(2013·四川高考)回答下列果蝇眼色的遗传问题。
课堂10分钟练习(三)——酶和ATP1.(2013·新课标卷Ⅱ)关于酶的叙述,错误的是()A.同一种酶可存在于分化程度不同的活细胞中B.低温能降低酶活性的原因是其破坏了酶的空间结构C.酶通过降低化学反应的活化能来提高化学反应速度D.酶既可以作为催化剂,也可以作为另一个反应的底物2.(2013·安徽高考)细胞代谢受酶的调节和控制。
下列叙述正确的是()A.激素都是通过影响靶细胞内酶活性来调节细胞代谢的B.代谢的终产物可反馈调节相关酶活性,进而调节代谢速率C.同一个体各种体细胞酶的种类相同、数量不同,代谢不同D.对于一个细胞来说,酶的种类和数量不会发生变化3.(2013·江苏高考)为了探究温度、pH 对酶活性的影响,下列实验设计不合理的是(多选)()A.实验①B.实验②C.实验③D.实验④4.(原创题)下图1表示三磷酸核苷的结构,图2表示ATP在能量代谢中的作用。
据图判断下列有关叙述错误的是()A.图1中N表示含氮碱基,若N为鸟嘌呤,则可表示GTPB.ATP中的能量可以来源于光能和化学能,也可以转化为光能和化学能C.UTP、GTP分子中的高能磷酸键是直接由物质氧化获能产生的D.人体成熟红细胞没有线粒体,但能产生ATP5.(原创题)酶的作用可被抑制剂阻止或减弱,酶抑制剂分为竞争性抑制剂和非竞争性抑制剂,两者作用特点如下图甲所示,图乙表示相应酶促反应速率。
下列有关叙述不.正确的是()A.曲线a可表示甲图中a的作用效果B.限制曲线a、b反应速率不再增加的因素是酶浓度C.曲线c表示在竞争性抑制剂作用下酶活性降低D.竞争性抑制剂与该酶催化的底物结构相似6.(2013·新课标卷Ⅱ)已知大麦在萌发过程中可以产生α淀粉酶,用GA(赤霉素)溶液处理大麦可使其不用发芽就产生α淀粉酶。
为验证这一结论,某同学做了如下实验:注:实验结果中“+”越多表示颜色越深。
表中液体量的单位均为mL。
课堂10分钟练习(二)——生命的结构基础1.(2013·北京高考)下列真核细胞结构与成分,对应有误的是()A.细胞膜:脂质、蛋白质、糖类B.染色体:核糖核酸、蛋白质C.核糖体:蛋白质、核糖核酸D.细胞骨架:蛋白质2.(2013·安徽高考)生物膜将真核细胞分隔成不同的区室,使得细胞内能够同时进行多种化学反应,而不会相互干扰。
下列叙述正确的是()A.细胞核是mRNA合成和加工的场所B.高尔基体是肽链合成和加工的场所C.线粒体将葡萄糖氧化分解成CO2和H2OD.溶酶体合成和分泌多种酸性水解酶3.(2013·天津高考)下列过程未体现生物膜信息传递功能的是()A.蔗糖溶液使洋葱表皮细胞发生质壁分离B.抗原刺激引发记忆细胞增殖分化C.胰岛素调节靶细胞对葡萄糖的摄取D.传出神经细胞兴奋引起肌肉收缩4.(原创题)根据结构与功能,内质网可分为粗面内质网和滑面内质网两种类型,如下图所示,粗面内质网主要与分泌蛋白的合成、加工有关,滑面内质网是脂质合成的重要场所,两种类型的内质网在不同细胞中分布不同,下列细胞中滑面型内质网分布较多的是()A.胰腺外分泌细胞B.浆细胞C.睾丸间质细胞D.神经细胞5.(原创题)溶酶体的主要功能是吞噬消化作用。
有两种吞噬作用:一种是自体吞噬;另一种是异体吞噬,如下图所示。
请据图判断下列叙述不.正确的是()A.清除细胞内衰老的细胞器是通过自噬作用实现的B.溶酶体参与抗原的加工处理过程C.溶酶体与吞噬体的融合体现了生物膜具有流动性D.吞噬细胞通过吞噬作用特异性识别抗原6.(原创题)动物细胞内低Na+高K+的离子环境对于神经冲动的产生、细胞渗透平衡等生命活动具有重要作用,这种浓度差与细胞膜上的Na+-K+泵有关,其作用原理如下图所示,下列说法不.正确的是()A.Na+和K+的运输方式为主动运输B.Na+-K+泵每次运输的Na+数量多于K+C.在细胞培养液中加入乌苯苷会影响K+的运输D.该运输过程的持续会导致大量ADP的积累7.(2013·江苏高考)右图为某细胞的部分结构及蛋白质转运示意图,请回答下列问题:(1)内质网上合成的蛋白质不能穿过________进入细胞核,表明这种转运具有________性。
一、名词解释1.发盘2.接受3.国际电子商务4.EDI5.有条件的接受6.逾期接受二、单项选择题1.我某出口公司于5月5日以电报对德商发盘,限8日复到有效。
对方于7日以电报回发出接受通知,由于电讯部门的延误,出口公司于11日才收到德商的接受通知,事后该出口公司亦未表态。
此时,()。
A 除非发盘人及时提出异议,否则,该逾期接受仍具有接受效力,合同成立B 不管我方是否及时提出异议,合同未成立C 只有发盘人毫不延迟地表示接受,该通知才具有接受效力,否则,合同未成立D 由电讯部门承担责任2.某公司向欧洲某客户出口一批食品,该公司于3月16日发盘,限3月20日复到有效,3月18日接对方来电称:“你方16日电接受,希望在5月装船。
”我方未提出异议。
于是()A 这笔交易达成B 需经该公司确认后交易才达成C 属于还盘,交易未达成D 属于有条件的接受,交易未达成3.根据《联合国国际货物销售合同公约》的规定,发盘和接受的生效采取()。
A 投邮生效原则B 签订书面合约原则C 口头协商原则D 到达生效原则4.英国某商人3月15日向国外某客商用口头发企,若英商与国外客商无特别约定,国外客商()。
A 任何时间表示接受都可使合同成立B 应立即接受方可使合同成立C 当天表示接受即可使合同成立D 在两三天内表示接受可使合同成立5.A公司5月18日向B公司发盘,限5月25日复到有效。
A公司向B公司发盘的第二天,A公司收到B公司5月17日发出的、内容与A公司发盘内容完全相同的交叉发盘,此时()。
A 合同即告成立B 合同无效C A公司向B公司或B公司向A公司表示接受已接受通知送达对方,合同成立D 必须是A公司向B公司表示接受且接受通知送达对方,合同成立6.下列条件中,()不是构成发盘的必备条件。
A 发盘的内容必须十分确定B 主要交易条件必须十分完整齐全C 向一个或一个以上特定的人发出D 表明发盘人承受约束的意旨7.我方6月10日向国外某客商发盘,限6月15日复到有效,6月13日接到对方复电称:“你10日电接受,以获得进口许可证为准。
初⼀语⽂上册第⼗课课堂练习题 努⼒造就实⼒,态度决定⾼度,为使在初⼀语⽂上册第⼗课的学习中取得进步,同学们要准备好⼀些课堂练习题来巩固知识点,接下来是店铺为⼤家带来的关于初⼀语⽂上册第⼗课的课堂练习题,希望会给⼤家带来帮助。
初⼀语⽂上册第⼗课课堂练习题⽬ 第⼀部分: 1.⽼舍原名 ,字 ,代表作有长篇⼩说等。
(3分) 2.《树林和草原》选⾃,作者是 国作家。
(3分) 3.根据拼⾳写汉字或给加点字注⾳:(3分) 狭窄( ) 贮蓄( ) ch哱plainng清( ) xi乗plainng边( ) 穹隆( ) 湿漉漉( ) 4.解释句⼦中词语的意思:(4分) ①在北中国的冬天,⽽能有温晴的天⽓,济南真得算个宝地。
温晴: ②济南是受不住⼤雪的,那些⼩⼭太秀⽓。
秀⽓: ③就凭这些绿的精神,⽔也不忍得冻上。
不忍得: ④⼭坡上卧着些⼩村庄,⼩村庄的房顶上卧着点雪。
卧: 5.在下列空⽩处填上恰当的词语:(3分) 那⽔呢, 不结冰, 在绿萍上冒着点热⽓,⽔藻真绿,……就凭这些绿的精神,⽔也不忍得冻上, 那些长枝的垂柳还要在⽔⾥照个影⼉呢! 6.下⾯句⼦中甲⼄两句哪⼀句表达效果好些,为什么?(4分) 甲:这⼀圈⼩⼭在冬天特别可爱,好像是把济南放在⼀个⼩摇篮⾥,它们安静不动地低声说:“你们放⼼吧,这⼉准保暖和。
” ⼄:这⼀圈⼩⼭围着济南,使济南在冬天也特别暖和。
7.《树林和草原》以第 ⼈称写作,这样写有什么好处?(4分) 8.⽤⽂中的⼀个词语来形容猎⼈⼀⼤早在灌⽊丛中漫步的感觉。
(4分) 9.把下⾯这段话⾥的句⼦重新排列,使之成为⼀段意思连贯、句序合理的短⽂:(4分) ⑴绿是⽣命的颜⾊。
⑵春⾬过后,草尖上、树梢上冒出了⼀簇簇嫩绿的叶芽,更会使你觉得新的⽣命在跳动。
⑶你看那春天的原野,绿油油的,⽣⽓勃勃,欣欣向荣,令⼈感到⿎舞和振奋。
⑷道旁的树⽊,青翠欲滴;⽥间的秧苗,郁郁葱葱。
⑸到了夏天,⼤地上⼀⽚葱茏。
课堂10分钟练习(十三)——实验与探究1.(2013·淮南一模)下列以新鲜洋葱为实验材料的生物学实验中,叙述正确的是() A.以鳞片叶内表皮为材料,盐酸处理后经健那绿染色可观察DNA的分布B.以鳞片叶为材料,捣烂取其汁液加入斐林试剂经水浴加热可检测蔗糖的存在C.以鳞片叶外表皮为材料,用0.3 g/mL蔗糖溶液处理可观察细胞的质壁分离和复原D.以根尖为材料,经低温等处理显微镜下观察到分生区少数细胞染色体数目加倍2.(2013·苏北四市二模)实验中的变量主要有自变量、因变量和无关变量。
下列控制无关变量的操作错误的是()A.验证光合作用能产生淀粉的实验中,首先将实验植物做饥饿处理B.探究唾液淀粉酶的最适pH的实验中,先将每一组温度控制在37℃C.验证光合作用需要光照的实验中,将叶片的一半用黑纸包住D.探究唾液淀粉酶最适温度的实验中,每一组都加入等量的淀粉3.下列有关实验及实验方法的描述,不.正确的是()A.用含15N尿苷的营养液培养洋葱,根尖分生区细胞的吸收峰值出现在间期B.研究遗传病发病率需在人群中随机抽样调查,研究其遗传方式需分析患者家系系谱图C.低温诱导植物染色体数目变化的实验中,卡诺氏液起固定细胞形态的作用D.DNA被15N标记的一个精原细胞,在含14N培养液中进行减数分裂,产生两个含15N 和两个不含15N的精细胞4.(2012·福建高考)下表是生物科学史上一些经典实验的叙述,表中“方法与结果”和“结论或观点”能相匹配的是()单侧光照射下,金丝雀草胚芽鞘向光弯曲生长,去尖端的胚芽鞘不生长也不弯曲将载有水绵和好氧细菌的装片置于黑暗且缺氧的环6.化感作用是指生活的或腐败的植物通过向环境释放化学物质而产生促进或抑制其他植物生长的效应。
某同学从网上查到“洋葱与小麦或豌豆为邻,洋葱的分泌物几秒钟内就会把小麦黑穗病病菌的孢子或豌豆的黑斑病的病菌置于死地(小麦黑穗病的病菌为裸黑粉菌,是一种真菌,孢子繁殖,孢子萌发后形成菌丝侵入穗部,使小麦患黑穗病)”。
I. 单项选择1. ---Are you sure you have ______ all the documents in your list?---Oh, sorry, I forgot to ______ the one you had sent me.A. included; containB. listed; includeC. listed; be includedD. contained; listed2. She didn’t come to his birthday party just ______what he had said to her the day before.A. becauseB. because ofC. as result ofD. thanks for3. If you want to do international trade successfully, ______ of English is _______.A. good command; a mustB. a good command; a needC. a good command; a mustD. good command; must4. If you can’t _____ a better plan, we have to carry out the present one.A. come along withB. come up withC. come acrossD. come about for5. She pretended to be calm but _______she was more than nervous at the time she was being questioned.A. in actualB. actuallyC. as matter of factD. in a fact6. Everybody has ______ to play ____ our environment.A. a part; to protectB. a role; in protectingC. part; in protectingD. a role; to protect7. When the expression first came into being, people refused to use it but _____ they began to accept it.A. usuallyB. graduallyC. frequentlyD. quickly8. You won’t be able to make wise _____ of a word until you know all the _____ of it.A. use; usesB. usage; usagesC. use; usagesD. usage; uses9. My elder sister is _____ studying in Britain and she can speak English quite fluently like a native speaker.A. in the presentB. at presentC. at the presentD. for the present10. Some minority (少数民族) languages are losing their ______ because of the invasion (入侵) of more popular spoken ones.A. ideasB. naturesC. identitiesD. characters11. Some animals ______ the tiger, the lion and the wolf are meat-eaters.A. such likeB. such asC. for exampleD. including12. Young students are ______ not to smoke both in and out school.A. suggestedB. requestedC. hopedD. invited13. No product is allowed to go into the market if it fails to _____ the quality standard.A. liveB. come up toC. meetD. go through14. Some people are good at _____ voices on the phone while others ______.A. knowing; aren’tB. recognizing; don’tC. knowing; don’tD. recognizing; aren’t15. Different people from different provinces speak English _____ different accents.A. inB. byC. withD. on16. ______ the direction of the experienced experts, they successfully carried out the experiment.A. WithB. ByC. InD. Under17. It is so nice to hear from her, _______, we last met more than 30 years ago.A. what’s moreB. that’s to sayC. in other wordsD. believe it or not18. ---Do you think it true that all the theories should ________ facts?---I don’t suppose so. If so, there would be no predictions.A. be made onB. be based onC. be set up withD. be built with19. The old mother was ______to see his long lost son home.A. a little more than happyB. more than a little happyC. happy more than a littleD. a little more happy than20. There is ______ is called Mr. Smith in our workshop.A. no such man asB. no such a man asC. no such manD. no such a man that第二节:完形填空(共20小题;每小题1分,满分20分)Mr. Glen is a millionaire. Five years ago, after returning from abroad to his motherland, he 21 his small company. Speaking of success, Glen often tells us a story about his extra expensive “school” fee. He always 22 his success to it.At that time, Glen, who already got a Ph.D. degree, 23 to return to the homeland, starting a company. Before leaving, he bought a Rolex watch with the 24 made through years of work after school and the scholarships. At the airport he had to accept the 25 customs check. The watch on his wrist was also demanded to be taken down for 26 . Glen knew that carrying the specific goods out had to pay the tax, and he worried about paying 27 for his watch. So when he was checked, he told a lie that his watch was a 28 fake(假货). When he was 29 of his “smarts”, immediately, in the presence of Glen, the officers hit the watch, 30 cost nearly 100,000, into pieces 31 hearing Glen’s words. Glen was 32 before he understood why, he was taken to the office to be examined 33 . For many times of entry-exit 34 he knew that only those people in the “blacklist” would “enjoy” this special treatment. The officers looked over everything carefully in the box, and 35 him no matter what time of entry and exit he must accept the check and if 36 reusing and carrying fake and shoddy goods, he would be 37 according to law! Suddenly, his face turned red, and he had nothing in mind after boarding the plane for long.After returning to the homeland, he often told the story to his family, and his employees, too. He said that this made a deep 38 on him, because the additional high “school” fee that he had ever paid made him realize the value of 39 , which he would remember as the 40 of his success forever.21. A. set up B. took up C. went up D. picked up22. A. honors B. mentions C. brings D. owes23. A. decided B. refused C. objected D. asked24. A. books B. things C. savings D. pounds25. A. ordinary B. routine C. regular D. common26. A. look B. inspection C. test D. experiment27 .A. one B. it C. them D. these28. A. priceless B. useful C. worthless D. valuable29. A. afraid B. proud C. ashamed D. hard30. A. that B. what C. as D. which31. A. on B. at C. who D. in32. A. disappointed B. delighted C. amazed D. satisfied33. A. strictly B. quietly C. quickly D. curiously34. A. conditions B. experiences C. experiments D. chances35. A. stopped B. hoped C. warned D. urged36. A. came out B. found out C. sent out D. set out37. A. hit B. blamed C. praised D. charged38. A. expression B. idea C. thought D. impression39. A. honesty B. lies C. goods D. bravery40. A. secret B. lesson C. choice D. belief第三部分:阅读理解(共小题,每小题2分,满分分)AYou need to be of a certain age to understand why so many people in Hollywood are caring about the possible closing down of Metro-Goldwyn-Mayer (米高梅电影公司).For the past 40 years, its output has been good, but now it is on the ropes, with debts of $ 3.7 billion and will have to sell off its most valuable assets (资产).In its golden time, MGM stood for something.If Warner Brothers meant social dramas and gangster movies, and Disney meant cartoon films, then MGM was healthy fantasy.This business model found its most glorious expression in its musicals (音乐剧) of the post-war era.It also featured such many famous stars as Fred Astaire, Frank Sinatra, Gene Kelly and Judy Garland.But MGM had always put its hopes on the quality of stars it could attract.From the time MGM became a company in 1924, the studio and his associate proved themselves good at creating big names.For 35 years, this worked well enough, but the growing power of television disturbed Hollywood.MGM continued to throw money into making gorgeous-looking musicals, but despite some big successes audiences gradually started to drift away.Throughout the sixties, MGM's decline set in.Things went from bad to worse.In 1973, MGM stopped distributing its own films.Since then, the Lion's roar has been reduced to a whimper (呜咽).How far MGM has fallen can be shown by its recent releases.This was a studio that for years offered a reliable supply of first-class films.Yet last year its total output was three.To make it worse, all were co-produced with other studios.And this year? Only one so far, and maybe the last.What now? MGM will probably be sold, though recent buyers have been cautious about a price thought to be around $ 2 billion.41. MGM is becoming the focus in Hollywood because it _______.A. has more supportersB. has produced good filmsC. might be closed downD. has lost all its assets42. What can we learn about MGM from the text?A. It has been sold out for around $ 2 billion.B. The Internet was a factor causing its decline.C. It only produced three films by itself last year.D. It made a wrong decision for its development.43. What's the main idea of the text?A. The past glories of MGM.B. The musicals made by MGM.C. The decline of MGM.D. A historical decision by MGM.BWe have two daughters: Kristen is seven years old and Kelly is four. Last Sunday evening, we invited some people home for dinner. I dressed them nicely for the party, and told them that their job was to join Mommy in answering the door when the bell rang. Mommy would introduce them to the guests, and then they would take the guests' coats upstairs and put them on the bed in the second bedroom.The guests arrived. I introduced my two daughters to each of them. The adults were nice and kind and said how lucky we were to have such good kids.Each of the guests made a particular fuss over Kelly, the younger one, admiring her dress, her hair and her smile. They said she was a remarkable girl to be carrying coats upstairs at her age.I thought to myself that we adults(成年人)usually make a big "to do" over the younger one because she's the one who seems more easily hurt. We do it with the best of intentions.But we seldom think of how it might affect the other child. I was a little worried that Kristen would feel she was being outshined. I was about to serve dinner when I realized that she had been missing for twenty minutes. I ran upstairs and found her in the bedroom, crying.I said, "What are you doing, my dear?"She turned to me with a sad expression and said, "Mommy, why don't people like me the way they like my sister? Is it because I 'm not pretty? Is that why they don't say nice things about me as much?"I tried to explain to her, kissing and hugging her to make her feel better.Now, whenever I visit a friend's home, I make it a point to speak to the elder child first.44. The underlined expression ' make a big "to do" over' (paragraph 4) means ______.A. show much concern aboutB. have a special effect onC. list jobs to be done forD. do good things for45. The guests praised Kelly for carrying coats upstairs because of her ______.A. beautiful hairB. pretty clothesC. lovely smileD. young age46. Kristen felt sad and cried because ______.A. the guest gave her more coats to carryB. she didn't look as pretty as KellyC. the guests praised her sister more than herD. her mother didn't introduce her to the guests47. We can conclude from the passage that ______.A. parents should pay more attention to the elder childrenB. the younger children are usually more easily hurtC. people usually like the younger children moreD. adults should treat children equally48. Which of the following statements is right?A. Kristen and Kelly are not getting along with each other.B. Kristen is older than Kelly.C. The mother likes Kristen more than Kelly.D. People usually talk more to Kelly than they do to Kristen.第二节(共5小题;每小题2分,共10分)根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。