【題目】— It's ______for us to take exercise every day.
— Yes. And we should go to bed early, too.
A.necessary
B.late
C.difficult

【答案】A
【解析】句意：——每天鍛煉對我們來說是很必要的�！堑�，我們也應該每天早睡。necessary必要的；late晚的；difficult困難的。根據(jù)句意可知選A。

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