题目

In order to make students have a good knowledge of science subjects, they are encouraged to______ their own science experiments.   A. operate    B. direct    C. manage    D. conduct 答案：D 解析: conduct意思为 “进行; 实施”；conduct an experiment做实验。operate 操作；开动(机器)等；direct管理；导演；manage 管理；处理；操纵。

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