【題目】It may be necessary to stop______ in the learning process and go back to the difficult points in the lessons.
A.at intervals
B.at random
C.at ease
D.at length

【答案】A
【解析】A．a(chǎn)t intervals 不時的；B．a(chǎn)t random隨意的；C．a(chǎn)t ease自在的；D．a(chǎn)t length詳盡地；句意：可能有必要在學習的過程中再停下來回顧一下本課的難點。根據(jù)語境，所以答案是A。

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