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
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
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
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