Question

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

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

Answer 1

【答案】A

【解析】

句意：这种药的副作用我们还不知道。需要更多的研究。A. unknown不知道的；B. unnecessary不必要的；C. unusual与众不同的；D. uncommon不寻常的。结合句意理解可知，这种药需要进一步的研究，说明对这种药的副作用还不了解，故答案选A。