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15辆车组成一列车队以速度v经过主席台，已知主席台长度为L，车长为S，每辆车之间的距离为车长的15倍，请问这列车队经过主席台需要多少时间？()

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A. 正确
B. 错误

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A. 正确
B. 错误

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In the last sentence of Paragraph 3 , "fewer but larger farms and fewer but more prosperous farmers" means

A. hired help is seldom needed
B. productivity on the farms has been raised greatly
C. productivity on the farms has fallen sharply
D. more food is never needed

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On today's farms, the chief reason why livestock is still raised would probably be______.

A. that farmers' conventions are difficult to be given up
B. that farmers want to gain more profit
C. that farmers have to do so
D. that farmers' work has been replaced by machines

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