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Doing sCiEnCE ExErCisEs oFtEn_______most oF thE...

B 考查短语辨析。takes off 飞机起飞,takes up 占据,从事,goes off 释放,goes up 上涨,句意:做科学锻炼经常回占据学生们的大多数业余时间。所以选B。

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