[外语类试卷]大学英语六级改革适用(阅读)模拟试卷277及答案与解析.doc
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1、大学英语六级改革适用(阅读)模拟试卷 277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(遗传的 )condition in his early 20s, and the Meissners had learned
2、that 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【 C3】 _about gender selection led them to Virginia, US where a new sperm(精子 )-separation technique, called MicroSort, wa
3、s under【 C4】_When MiShel became pregnant, she gave birth to a daughter. They will try to have a second daughter using the technique later this year. This is not only a【 C5】 _effective way to select a childs gender. It also brings a host of ethical(伦理的 )and practical considerations especially for the
4、 majority of families who use the technique for【 C6】 _reasons. The clinic offers sex selection for two purposes: to help couples【 C7】 _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 i
5、s still【 C9】 _However, Blauer says the company has an【 C10】 _success rate: 91 per cent of the women who become pregnant after sorting for a girl are successful, while 76 per cent who sort for a boy and get pregnant are successful. A)genetic B)overlapped C)impressive D)unaffected E)perpetually F)inve
6、stigation G)inquiries H)feats I)disorder J)gropes K)experimental L)seemingly M)elicit N)nonmedical O)avoid 1 【 C1】 2 【 C2】 3 【 C3】 4 【 C4】 5 【 C5】 6 【 C6】 7 【 C7】 8 【 C8】 9 【 C9】 10 【 C10】 10 Its a good idea to apply sunscreen before heading to the beach if you dont want to burn. But for marine anim
7、als like whales, they dont have that【 C1】 _Species like sperm whales can spend up to six hours at the oceans surface in between dives,【 C2】_in the sunlight. So how do they protect themselves from a serious case of sunburn? It turns out that their bodies have a similar defense【 C3】 _against the suns
8、UV radiation as people. Blue whales which have the lightest skin color of the three species tan during their summer stay before【 C4】 _, back to their northern feeding grounds. Sperm whales dont tan. They can receive an “overdose“ of UV radiation during their hours at the oceans surface, and they hav
9、e proteins that【 C5】_protect their cells from UV damage. This process is【 C6】 _to how human bodies produce antioxidants in response to molecules that can cause a lot of genetic and cellular damage. And fin whales escape sun damage thanks to their high levels of melanin a dark substance in the skin t
10、o protect humans from UV radiation. Older whales and whales with less【 C7】 _of melanin in their skin like blue whales had the greatest level of damage in their mtDNA. Fin whales, which had the greatest amount of melanin, had the least amount of mtDNA damage. Now that the ozone layer that shields Ear
11、th from UV radiation is gradually【 C8】_its important to know what the consequences are for whales and dolphins, especially for【 C9】 _or endangered species. Although its difficult to tell what causes many of these skin conditions, UV damage is one cause. Even though whales have【 C10】 _defenses to UV
12、radiation, high exposure can still be harmful. A)similar B)diminishing G)liability D)migrating E)mutual F)mechanism G)effectively H)jerking I)instantaneously J)vulnerable K)content L)baking M)inherent N)perspective O)option 11 【 C1】 12 【 C2】 13 【 C3】 14 【 C4】 15 【 C5】 16 【 C6】 17 【 C7】 18 【 C8】 19 【
13、 C9】 20 【 C10】 20 If you didnt know any better, you might think that Star, Snuppy, CC and ANDi were just a bunch of interesting names. Youd only be half right. These creative names【 C1】 _belong to a pig, a dog, a cat and a monkey that were among the first clones of their species. Youre likely alread
14、y familiar with Dolly the sheep that achieved near【 C2】_status as the first mammal to be cloned successfully using adult animal cells. But Dolly is not alone. The worlds first clone a tadpole was actually created as early as in 1952. And at least a dozen different species have been cloned since: eve
15、rything from the common cow to the【 C3】 _guar, a type of wild ox. Animal cloning has come a long way since that first tadpole more than 50 years ago. The U.S. Food and Drug Administrations(FDA)declaration in early 2008 that food products【 C4】 _from the clones of cows, pigs and goats are safe for hum
16、an consumption【 C5】 _an already growing interest in the process. Cloning may have【 C6】 _uses besides its ability to help farmers【 C7】_breed quality burgers and bacon. Other potential uses【 C8】 _the preservation of species, biomedical research, drug and organ production and even commercial ventures.
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