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
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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