2. 外语
  3. It was 10 years ago, on a warm July night, that a newborn lamb took her first breath in a small shed in Scotland. From the outsi

It was 10 years ago, on a warm July night, that a newborn lamb took her first breath in a small shed in Scotland. From the outsi

admin2015-03-13  39
问题     It was 10 years ago, on a warm July night, that a newborn lamb took her first breath in a small shed in Scotland. From the outside, she looked no different from thousands of other sheep born on【C1】______farms. But Dolly, as the world soon came to realize, was no【C2】______lamb. She was cloned from a single cell of an adult female sheep,【C3】______long-held scientific dogma that had declared such a thing biologically impossible.
    A decade later, scientists are starting to come to grips with just how different Dolly was. Dozens of animals have been cloned since that first lamb—mice, cats, cows and, most recently, a dog—and it’s becoming【C4】______clear that they are all, in one way or another, defective.
    It’s【C5】______to think of clones as perfect carbon copies of the original. It turns out, though, that there are various degrees of genetic【C6】______. That may come as a shock to people who have paid thousands of dollars to clone a pet cat only to discover that the baby cat looks and behaves【C7】______like their beloved pet—with a different-color coat of fur, perhaps, or a【C8】______different attitude toward its human hosts.
    And these art just the obvious differences. Not only are clones【C9】______from the original template(模板)by time, but they are also the product of an unnatural molecular mechanism that turns out not to be very good at making【C10】_______ copies. In fact, the process can embed small flaws in the genes of clones that scientists are only now discovering.
A)abstract I)nothing
B)completely J)ordinary
C)deserted K)overturning
D)duplication L)separated
E)everything M)surrounding
F)identical N)systematicaly
G)increasingly O)tempting
H)miniature
【C9】
选项
答案L
解析 该空格位于from之前，且句中有are，故推测空格处应填入动词的过去分词形式，表示被动含义。能够和from搭配的动词只有separated，意为“与……分离”，本句是指“克隆生物不仅随着时间的推移与原版相分离”。备选动词中，deserted意为“放弃”，不符合文意，故排除。
转载请注明原文地址:https://kaotiyun.com/show/30h7777K
0

大学英语六级

相关试题推荐
随机试题
最新回复(0)