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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