The passage mainly discusses . The phrase "biological carbon copies" (para. 4) refers to .

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问题 The passage mainly discusses ______.
The phrase "biological carbon copies" (para. 4) refers to ______.

选项 A、physical characteristics of real market value
B、body tissues
C、cloned animals
D、stem cells

答案C

解析

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公共英语五级笔试

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