【題目】 cloning human embryos is not legal in many countries, some scientists are already pushing ahead with research in order to produce a cloned human baby.

A. As B. If

C. Unless D. While

【答案】D

【解析】考查連詞。A. As由于；B. If如果；C. Unless 除非； D. While盡管。句意： 雖然克隆人類胚胎是違法的，但一些科學(xué)家已經(jīng)在努力推進(jìn)研究為了制造克隆的人類嬰兒。選A。

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