单项选择题

Top soil ______.

A．is good for agriculture
B．is useless and unproductive
C．is found only in desert regions
D．is dry and sandy
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单项选择题
If there were no trees ______.
A．the land would became fertile
B．heavy rains would clean the tropics
C．the rich top soil couldn't be held
D．there would be no agriculture
单项选择题
Top soil means ______.
A．useless soil
B．soil found under the earth
C．soil on the surface of the earth
D．dry soil which is found in the desert
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