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
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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
单项选择题
The doctor told the farmer ______.
A．something new about his illness
B．to go on taking the medicine the doctor had given him earlier
C．to come again
D．that he was going to give him some more medicine
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