1、【 精品教育资源文库 】 Unit 3 Back to the past 一、阅读理解。 Crossing your legs is an extremely common habit; most people dont even notice that theyre doing it when they sit down. While you may find it comfortable to sit with one knee crossed over the other, it might be causing health problems that you are not awa
2、re of. A study published in Blood Pressure Monitoring stated that sitting with your legs crossed can increase your blood pressure. The reason for this is that the blood in your legs has to work against gravity to be pumped back to your heart and that crossing one leg over the other increases resista
3、nce, making it even harder for the blood to circulate. This causes your body to increase your blood pressure to push the blood back to the heart. You wont feel any immediate effects, but repeated, drawn-out increases in blood pressure can cause long-term health issues. So, planning to sit for a long
4、 period of time? Dont keep your legs crossed. Crossing your legs at the knee can also cause pressure on the major nerve in your leg that passes just below your knee and along the outside of your leg, explains Richard Graves, a medical expert. This pressure can cause numbness and temporary paralysis
5、(麻痹 ) of some of the muscles in your foot and leg, preventing you from being able to raise your ankle what we know as that “ pins and needles” sensation. While the feeling of discomfort may only last a minute or two, repeatedly crossing your legs until they feel numb can cause permanent nerve damage
6、. So next time you sit down, try to get yourself in the habit of sitting with both of your feet on the floor. Not only will it help your posture and stability, but it will also save your health in the long run. 1.What can we learn about crossing ones legs? A. It is a very bad social habit. B. It is
7、usually practiced deliberately. C. It can make others feel uncomfortable. D. It can do harm to peoples health. 【 精品教育资源文库 】 2.According to the study, sitting with your legs crossed can_. A. resist gravity effectively B. affect your blood pressure C. lead to heart attacks easily D. improve the funct
8、ion of legs 3.In the third paragraph “pins and needles“ probably means_. A. serious muscle injuries B. being a little nervous C. slight sharp pains D. being highly flexible 4.What is the main purpose of the text? A. To give readers some advice. B. To compare common habits. C. To evaluate effects of
9、an experiment. D. To introduce research methods. 【文章大意】本文是一篇说明文，主要介绍了研究发现跷二郎腿对身体有害，大家要改掉跷二郎腿的坏习惯。 1.D 【解析】 细节理解题。根据第一段中的 “ it might be causing health probl ems that you are not aware of.” 可知，跷二郎腿对健康有害。 2.B 【解析】 细节理解题。根据第二段中的 “ sitting with your legs crossed can increase your blood pressure.” 可知，跷二郎腿
10、会使血压升高。 4.A 【解析】 文章意图题。根据文章内容，特别是第一段中的 “it might be causing health problems that you are not aware of.” 及最后一段中的 “So next time you sit down, try to get yourself in the habit of sitting with both of your feet on the floor.” 可知，研究发现跷二郎腿对健康有害，因此这篇文章的目的是建议大家改掉跷二郎腿的坏习惯。 二、单项选择。 1.Our hearts sank at the ne
11、ws that a pipeline _ in Qindao and 62 people couldnt survive the d isaster. A. remove B. exploded C. reserve D. attacked 【答案】 B 【解析】句意：听到青岛输油管爆炸的消息我们的心沉下去了， 62 个人不能幸免于这场灾难。 exploded“ 爆炸 ” ， 符合句意。 remove 移除， reserve 储备， attack 袭击。 【 精品教育资源文库 】 2._ is no doubt _ Jennifer will come to see me this week
12、end as usual. A. It, that B. It, whether C. There, that D. There, whether 【答案】 C 【解析】 doubt 用作名词时，在肯定句中，其后从句常用 whether 引导；在否定句和疑问句中使用 that 引导从句。 There is no/little doubt that.是常用句式。 句意：毫无疑问珍妮佛这个周末会像往常一样来看我。 3.He turned from side to side, eyeing himself in the mirror with a serious, studied _ that so
13、on changed into a smile. A. impression B. expression C. conclusion D. information 【答案】 B 【解析】句意：他在镜子面前转过来调过去地打量着自己，脸上严肃的表情不一会儿就变成了微笑。 impression 印象； expression 表情，表达； conclusion 总结；information 信息 。 4.Mr. Green is always devoted to his work and has a sense of responsibility. Thats why he was asked to
14、 _ the company when managers health was declining. A. take over B. hand over C. turn over D. trip over 【答案】 A 【解析】句意：格林先生工作上很投入且富有责任心，那也是为什么当经理身体不好时让请 他掌管公司的原因所在。 take over 接管，掌管； hand over 移交； turn over移交，翻阅； trip over 绊倒。 5.John is appointed to attend the meeting in place of the manager, who has _
15、 flu. A. come up with B. come down to C. come down with D. come up against 【答案】 C 【解析】 句意：约翰被派去代替经理参加会议，经理得了 流感 。 come down with 患 (病 )，符合题意。 come up with 提出，想出； come down to 归根结底，可归结为； come up against 面对，遭到?的反对。 6.Perhaps the most visible sign of the _ of private wealth in China tries hard not to b
16、e visible at all - the private bodyguard. A. introduction B. explosion C. immigration D. investment 【答案】 B 【 精品教育资源文库 】 【解析】句意：在中国，私人财富暴增最明显的迹象大概正是富人试图努力不让人察觉的 私人保镖。 explosion 意为 “ 突增，激增 ” ，符合语境。 introduction 介绍； immigration移居 ， 移民人数 ； investment 投资。 7.There is some doubt among people_$ 749 is too
17、much for an iphone4. A. that B. whether C. what D. if 【答案】 B 【解析】句意：许多人怀疑是否花 749 美元买个苹果四太多了。 There is some doubt whether.是个固定句型， doubt 是名词，后面跟 whether 引导的同位语从句。 8.By doing so， I can not only share good ideas with others but also learn to _ myself clearly. A. express B. expose C. enquire D. distribut
18、e 【答案】 A 【解析】 express 表达； expose 泄露 ， 透露 ， expose sth. to sb.将某事暴露给 ? ； enquire 询问； distribute 分发。 句意：这么做，我不仅可以跟别人分享好的想法，还可以学会清楚地表达自己。 9. As we know, keeping positive is beneficial to the process of our work and study. You can say that again. Struggle not to let negative ideas _. A. take over B. tak
19、e off C. take on D. take up 【答案】 A 【解析】 take over 接管，控制； take off 起飞，成名； take on 呈现； take up 从事；句意：“正如我们知道的那样，保持乐观对于我们的工作和学习的过程都有好处。”“你可以再重复这句话。努力不让消极的想法左右你 (控制你 )。” 10. Four dollars a pair? I think its a bit too much. If you buy three pairs, the price for each will _ to three fifty. A. come down B.
20、 take down C. turn over D. go over 【答案】 A 【解析】句意： “四美元 一双？我觉得有点贵了。 ”“ 如果你买三双，每双降价到 三点五美元 。 ”come down 下来，降低； take down 记下； turn over 移交给，把 ? 反过 来； go over 重温，复习 。 11. As a teenager, our son should have two or three hobbies to be really happy. _, but how can he afford the time with so much homework e
21、very day? 【 精品教育资源文库 】 A. So does he B. So he does C. So should he D. So he should 【答案】 D 12.The engine just wont start. Something seems _ wrong with it. A. to go B. to have gone C. going D. having gone 【答案】 B 【解析】动词 seem 之后用不定式，排除 CD 项； to do 表将来， to have done 表完成 。 根据句意 “ 引擎就是发动不起来，看起来好像出了什么毛病 ” 可知答案为 B。 13.Generally, students inner motivation with high expectations from others _ essential to their development. A. is B. are C. was D. were 【答案 】 A 【解析】 主语 “students inner motivation” 表示单数意义，所以谓语动词用单数，并且
