2. 职称英语
  3. It was 10 years ago, on a warm July night, that a newborn lamb took her firs

It was 10 years ago, on a warm July night, that a newborn lamb took her firs

游客2023-08-22  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 [br] 【C4】
选项
答案 G
解析 空格位于becoming之后，clear之前，故空格处应该是副词作状语，修饰形容词。根据句意，逐渐清晰的事实是这些克隆生物在某种程度上都是有缺陷的，故选副词increasingly，能表达出这种“渐进性”。备选项中，completely过于绝对，而nothing和systematically不符合文意，故均排除。
转载请注明原文地址:http://tihaiku.com/zcyy/2947914.html
相关试题推荐
随机试题
最新回复(0)