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 writer think about the creation of new desert areas
A．It is a natural development.
B．The problem is not very serious.
C．It is a very worrying problem.
D．The situation will improve in tim
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.
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