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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单项选择题
Land is becoming desert little by little because ______.
A．plants can't grow there
B．there is not enough rain
C．people haven't done what scientists wish them to do
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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