单项选择题

A．Spend more time in the library.
B．Write just one paper for all his classes.
C．Drop one of his courses.
D．Write three papers on closely related topics.
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单项选择题
A．They will check the traffic light.B．They will wait for a little longer.C．They will call Nancy.D．They will check the time of high tide.
A．They will check the traffic light.
B．They will wait for a little longer.
C．They will call Nancy.
D．They will check the time of high tide.
填空题
A deep knowledge of the habits of the animals in parks and in the wild can help man to ______.
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