【題目】As we all know, ____________ cloning is the creation of cells or the whole animals using DNA from ____________ single “parent”.

A. the; a B. a; a

C. /; a D. /; the

【答案】C

【解析】考查冠詞。句意：眾所周知，克隆是使用來自于一個母體的DNA創(chuàng)造細胞或整個動物。cloning是一個抽象名詞，前面不用冠詞；第二空表示來自一個單一的母體，故用不定冠詞a。故選C。

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