【題目】New medicines and instruments every day to extend life.

A. develop B. are being developed

C. are developing D. have developed

【答案】B

【解析】

句意：為了延長生命，每天都在研制新的藥物和儀器�？疾閯釉~語態(tài)辨析題。new medicines and instruments是動詞develop的受動者，需用被動語態(tài)，ACD三項都是主動語態(tài)，可排除。根據(jù)句意結(jié)構(gòu)，可知選B。

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