题目内容

It may be necessary to stop ________ in the learning process and go back to the difficult points in the lessons.

A. at large
B. at intervals
C. at random
D. at length

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________ quantities of water are being used nowadays with the rapid development of industry and agriculture.

A. Excessive
B. Extensive
C. Effusive
D. Exclusive

________ recent developments we do not think your scheme is practical.

A. In view of
B. In favor of
C. In case of
D. In honor of

When you buy the spare parts for your car, try to get the _______ ones from the authorized dealer.

A. genuine
B. true
C. raw
D. veritable

PN结正偏导通，反偏截止，称为PN结的性能。