单项选择题

Desert ______.

A．get very little rain
B．never have any plants or animals in them
C．can all be turned into good land before long
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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
单项选择题
From this passage, we learn that ______.
A．plants can keep dry land from becoming desert
B．it is good to get rid of the grass in the desert
C．all places without much rain will become desert
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