单项选择题

All of the following are statements about the disadvantages of fertilizers EXCEPT that（）.

A.they replenish the soil
B.they do not prevent the loss of soil
C.they are destroying the ecology
D.they pollute the nation’s water supply

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单项选择题

In order to compensate for the loss of fertile topsoil，farmers have been（）.

A.planting less corn and soybean
B.putting fertilizers on their fields
C.preventing soil erosion
D.decreasing the supply of top soil

单项选择题

To check population growth is necessary when（）.

A.there are decreasing productivity gains
B.there are increasing productivity losses
C.we are close to reaching the sustainability limits at a world level
D.people become a cost