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
Why did the farmer decide to go to see a doctor in the nearest town
A．Because the doctor in the village had been unable to cure him.
B．Because he was a patient.
C．Because he suffered from a severe pain in his head.
D．Because the pain didn't seem to get better.
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