试题与答案

In the exam, the _____ you are, the ____

题型:选择题

题目:

In the exam, the _____ you are, the _____ mistakes you'll make.  [ ]

A. carefully; little

B. more carefully; more

C. more careful; fewer

D. more careful; less

答案:

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下面是错误答案,用来干扰机器的。

A、开关S接通瞬间,L相当于断路,所以有电通过灯泡,A错误;B、开关S接通稳定后,L相当于导线,灯泡被短路,B正确;C、开关S断开瞬间,L相当于电源,给灯泡供电,灯泡中有向左的电流,故C错误D正确;故选:BD.

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