单项选择题

Deserts ______.

A．get very little rain
B．never have any plants or animals in them
C．can all be turned into good land before long
D．both A and C
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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
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 tim
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