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【单选题】
考虑下列四个实例。你认为哪一个实例中物体和地球构成的系统的机械能不守恒 ?
A.
物体作单摆运动（阻力可忽略）
B.
物体作斜抛运动（忽略空气阻力）
C.
物体在拉力作用下沿光滑斜面匀速上升
D.
物体在光滑斜面上自由滑下
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【单选题】W: I hurt my leg. I fell down the stairs just now. M: You had better stay in bed, and I will call a doctor. What does the man want the woman to do?
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【单选题】Read and complete. 请选择恰当的连词补全句子。 1. You had better stay at home_______ the air is bad.
A.
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