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翻转课堂的教学活动是围绕教学视频展开的。
A．正确
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B．错误
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问答题
Suppose one could either rent a car or take a train to travel to Chicago from Washington, D.C. If the price of train tickets increases:
答案：
A.the demand for rental cars will decrease.
B.the demand...
B.the demand...
