考研英语
A.tended
B.feared
C.happened
D.threatened
【考查重点】语义衔接/固定搭配
【解题过程】本题目选择动词(过去式),与介词“to”构成动词短语,在句子中充当谓语。选项A. tended to易于,往往会……;B. feared to 害怕做某事;C. happened to 碰巧做某事;D. threatened to 威胁要做某事。Fruit flies who were taught to be smarter than the average fruit flyto live shorter lives. 原文讲述的是在实验中经常发生的一种情况,即“通过训练变得更聪明的果蝇,其寿命往往比普通果蝇短”。故选A。
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