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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单项选择题
According to the passage some desert areas were once ______.
A．fertile lands
B．covered by rivers
C．very cold
D．very dry and useless lands.
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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