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问题 选择题

This is a new bag, _________I don't like it.  [ ]

A. but    

B. or    

C. and    

D. well

答案

答案：A

填空题

长为L＝0.5m的轻质细杆OA，A端有一质量为m＝1.0kg的小球，小球以O为圆心在竖直面内做圆周运动，通过最高点时小球的速率是2m/s，g取10m/s2，则此时刻细杆OA受到小球给的作用力大小为_______________，方向为____________．
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选择题

With everyone’s face_________behind the mask, it’s hard to tell who they really are.

A．having hidden

B．being hidden

C．hidden

D．hiding
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