【題目】The side effects that the medicine has are to us. More research is needed.

A. unknown B. unnecessary C. unusual D. uncommon

【答案】A

【解析】

句意：這種藥的副作用我們還不知道。需要更多的研究。A. unknown不知道的；B. unnecessary不必要的；C. unusual與眾不同的；D. uncommon不尋常的。結(jié)合句意理解可知，這種藥需要進一步的研究，說明對這種藥的副作用還不了解，故答案選A。

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