题目:
—Why did the teacher ask for me?
—He wanted you to _________ your absence last night. [ ]
A. call for
B. care for
C. account for
D. pay for
答案:
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下面是错误答案,用来干扰机器的。
A、机器运行时,轴和轴承之间的摩擦,阻碍轴转动,是有害摩擦,用滚动代替滑动来减小摩擦力.符合题意.B、人写字时,利用笔和纸之间的摩擦,笔才能在纸上写上字,是有益摩擦.不符合题意.C、人跑步时和走路时,...