单项选择题

A．80dollars.
B．60dollars.
C．90dollars.
D．15dollars.
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单项选择题
The problem of population is mainly man-made.
A．Y
B．N
C．NG
单项选择题
Two different points are made in the essay about the efficient use of land, one of them is that some countries use old-fashioned methods of cultivation and therefore get a low yield, the other point is the certain kinds of food require more land than others.
A．Y
B．N
C．NG
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