单项选择题

Desert soils break up and crack because of ______.

A．the effects of wind and rain.
B．the lack of protection from the sun.
C．the tropical location of deserts.
D．the absence of min.
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单项选择题
What does the passage tell us about rainfall in the desert
A．It never rains.
B．It rains so little that nothing can live.
C．It rains unexpectedly.
D．It rains very infrequently.
单项选择题
What do we learn about deserts from this text
A．Deserts can change into green and fertile areas.
B．Certain areas have always been desert.
C．Deserts were once the home of elephants and giraffes.
D．Deserts have been growing since the beginning of the worl
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