A:go o
B:get through
C:go over
D:get along
_+ _= _
猜猜下面说的是哪种小动物。
Its ears are long. Its eyes are small. Its mouth is small. Its tail is short. What is it?
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用力推课桌的下部,课桌会沿地面滑动,而推课桌的上部,则课桌可能会翻倒,这说明力的作用效果( )