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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
D．scientists know little about the deserts

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单项选择题Which is the main idea of the first paragraph

A．Scientists know how to change desert into good land.
B．Land is becoming desert faster than scientists can change it back into good land.
C．If scientists can bring water to desert, people can live and grow food theory.
D．More and more places are becoming deserts all the time.

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．they hold water
D．all of the above