[外语类试卷]大学英语四级改革适用(阅读)模拟试卷209及答案与解析.doc
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1、大学英语四级改革适用(阅读)模拟试卷 209及答案与解析 Section A 0 Once they decided to have children, MiShel and Carl Meissner tackled the next big issue: Should they try to have a girl? It was no small matter. MiShels brother had become blind from a hereditary condition in his early 20s, and the Meissners had learned that
2、the condition is a【 C1】 _passed from mothers to sons. If they had a boy, he would have a 50 per cent chance of having the condition. A girl would be【 C2】 _. The British couples inquiries about gender selection led them in 1999 to Virginia, US where a new sperm (精子 )-separation technique, called Micr
3、oSort, was under【 C3】_. When MiShel became pregnant, she gave birth to a daughter. They will try to have a second daughter using the technique later this year. The technique separates sperm into two groups those that carry the X-chromosome (producing a female baby) and those that carry the Y-chromos
4、ome (producing a male baby). The technology was developed in 1990s, but last months opening of a laboratory in California【 C4】 _the companys first expansion. “We believe the number of people who want this technology is greater than those who have【 C5】 _to it,“ said Keith L. Blauer, the companys clin
5、ical director. This is not only a【 C6】 _effective way to select a childs gender. It also brings a host of ethical (伦理的 ) and practical considerations especially for the majority of families who use the technique for【 C7】 _reasons. The clinic offers sex selection for two purposes: to help couples avo
6、id passing on a gender-linked【 C8】 _disease and to allow those who already have a child to balance“ their family by having a baby of the opposite sex The technology is still【 C9】 _. However, Blauer says the company has an impressive success rate: 91 per cent of the women who become pregnant after so
7、rting for a girl are successful, while 76 per cent who sort for a boy and get pregnant are successful. The technique separates sperm based on the fact that the X-chromosome is larger than the Y-chromosome. A machine is used to【 C10】 _the size differences and sort the sperm accordingly. The result is
8、 then checked using another type of DNA analysis to ensure that it contains mostly X-or Y-bearing sperm. The desired sample is then used for artificial insemination (授精 ) or test tube fertilization. A. genetic B. overlapped C. marked D. unaffected E. perpetually F. investigation G. access H. feat I.
9、 disorder J. gropes K. experimental L. seemingly M. elicit N. nonmedical O. distinguish 1 【 C1】 2 【 C2】 3 【 C3】 4 【 C4】 5 【 C5】 6 【 C6】 7 【 C7】 8 【 C8】 9 【 C9】 10 【 C10】 10 The greenhouse effect causes trouble by raising the temperature of the planet. The【 C1】 _rise is not very much, but the Earths
10、ecosystem is very weak, and small changes can have large effects. It has been believed that this【 C2】 _of one degree will happen by the year 2025. This could probably【 C3】 _the North American corn belt, which produces much of the worlds grain,【 C4】 _to much higher food prices, and even less food for
11、 the Third World than they already have. However, it would also mean that some countries which are further north would be able to【 C5】 _crops they had never been able to before, although there is less land as you move north from the corn belt. The other serious worry is that rising sea levels from t
12、he melting of the polar ice could【 C6】 _flood many countries. A rise in sea levels of one meter, which many experts are【 C7】 _by the year 2100 (and some as soon as 2030), would flood 15 percent of Egypt, and 12 percent of Bangladesh. The Maldives in the Indian Ocean would almost【 C8】 _disappear. Mos
13、t of the countries which would suffer most from a rise in sea levels are the poor【 C9】 _states, so the islands in the Caribbean, South Pacific, Mediterranean and Indian Ocean have formed the Alliance of Small Island States, AOSIS, so they have a【 C10】 _voice in international politics and can make th
14、e richer developed world listen to their problems. A. severely B. damage C. island D. critical E. grow F. mainland G. louder H. predicting I. rise J. completely K. geometry L. actual M. extending N. leading O. develop 11 【 C1】 12 【 C2】 13 【 C3】 14 【 C4】 15 【 C5】 16 【 C6】 17 【 C7】 18 【 C8】 19 【 C9】 2
15、0 【 C10】 20 Many people wonder why some men want to live on the moon It is【 C1】_not the kind of place where most men would choose to live. But man has always moved to new areas. Some scientists hope that continued work will be done on the moon. Many experiments will be done there more【 C2】 _. Some l
16、arge【 C3】 _are very easy to do in a place without air. Matter can be heated to very high temperatures without【 C4】 _change when it is in such a place. Air, dust, and clouds cannot【 C5】_mans view of space from the moon. The very high or very low temperatures and low gravity on the moon will be used f
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