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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单项选择题

How much of the world's land surface is at risk of becoming desert

A．Less than ten million square kilometers.
B．Twenty million square kilometers.
C．Mom than twenty million square kilometers.
D．30% of the world's land surfac

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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