题目内容

常微分方程是研究动力系统的重要基础

A. 对
B. 错

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She is such a ________ tennis player.

A. good
B. well

He passed his test ____________.

A. easy
B. easily

She is a very _________ worker.

A. slow
B. slowly

My mother speaks __________ English.

A. perfect
B. perfectly