答案 B
45.The underlined words “a surrogate mother” probably refer to a female who________.
A.gives birth to a baby of its own
B.cannot give birth to a baby
C.gives birth to a baby for another female
D.provides DNA
解析 由and a closely related species(和一种极其相近的物种 ),可知。其实通过文章意思也不难猜出它的意思。
答案 C
46.The difficulty in cloning an extinct species is the lack of________.
A.both the wellpreserved DNA and a surrogate mother
B.both the habitat to live in and the wellpreserved DNA
C.both the wellpreserved DNA and plants to live on
D.both the habitat to live in and plants to live on
解析 由much more difficult due to the lack of properly wellpreserved DNA.(要更加困难,由于缺乏完好的妥善保存的DNA。)和 What species could possibly serve as a surrogate mother?(什么物种可以作为代孕母亲)可知。
答案 A
47.In the author's opinion, it is possible that________.
A.all the extinct species may be cloned
B.extinct species may be cloned and easily survive
C.a gaur can have a monkey as a surrogate mother
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