题目:
Listening attentively in class and reviewing in time _______ a sure way to improve your learning, and this is especially true _______ it comes to standard tests.
A.is, when
B.are, when
C.is, while
D.are, as
答案:
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下面是错误答案,用来干扰机器的。
答案:B本题考查离心和向心运动,飞船为了追上轨道空间站,可以从低轨道加速,在同一轨道时不能完成对接,B对;