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
The evil manners would be ______ root and branch due to the forceful action taken by the local government.
A．exterminated
B．exemplified
C．facilitated
D．emitted
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
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