39（）A.abstractB.completelyC.desertedD.duplicationE

单项选择题

Questions 36 to 45 are based on the following passage. It was 10 years ago, on a warm July night, that a newborn lamb with took her first breath in a small shed in Scotland. From the outside, she looked no different from thousands of other sheep born on __36__ farms. But Dolly, as the world soon came to realize, was no __37__ lamb. She was cloned from a single cell of an adult female sheep, __38__ 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 little lamb — mice, cats, cows and, most recently, a dog — and it’s becoming __39__ clear that they are all, in one way or another, defective. It’s __40__ to think of clones as perfect carbon copies of the original. It turns out, though, that there are various degrees of genetic __41__. That may come as a shock to people who have paid thousands of dollars to clone a pel cat only to discover that the baby cat looks and behaves __42__ like their beloved pet — with a different-color coat of fur, perhaps, or a __43__ different attitude toward its human hosts. And these are just the obvious differences. Not only are clones __44__ 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 __45__ copies. In fact, the process can embed small flaws in the genes of clones that scientists arc only now discovering.

39（）

A.abstract
B.completely
C.deserted
D.duplication
E.everything
F.identical
G.increasingly
H.miniature
I.nothing
J.ordinary
K.overturning
L.separated
M.surrounding
N.systematically
O.tempting