单项选择题

Small green plants are very important to dry places because ______.

A．they don't let the sun make the earth even drier
B．they don't let the wind blow the earth away
C．all of the above
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单项选择题
The stranger had to walk to the next village because there was no bus going there.
A．Right.
B．Wrong.
C．Doesn't say.
单项选择题
Finally the old man gave the stranger the answer because he knew how fast the stranger could walk.
A．Right.
B．Wrong.
C．Doesn't say.
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