28． Which is NOT true?A． The land never stops becoming deserts．B． Scientists ask the people to live in the deserts and grow food there．C． People do bad things to the earth．D． Scientists may not be able to change the deserts．
28． Which is NOT true?
A． The land never stops becoming deserts．
B． Scientists ask the people to live in the deserts and grow food there．
C． People do bad things to the earth．
D． Scientists may not be able to change the deserts．
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BScientists are trying to make the deserts into good land again． They want to，bring water to the deserts． But more and more places of the earth is becoming deserts all the time， Scientists may not be able to change the deserts． Scientists think that people make deserts． People are do-ing bad things to the earth．Some places on the earth don-t get very much rain． But they still don-t become deserts．This is because some green plants are growing there． Small green plants and grass are very helpful to dry places． Plants don't let the wind blow the earth away． When 8 little bit of rain falls，the plants hold the water． Without plants，the land can become a desert much more easily．( )26． Why can the land become a desert?A． Because some places don't get very much rain．B． Because plants don-t let the hot sun make the earth even drier．C． Because people don't keep the earth well．D． Because scientists haven-t learnt enough about the deserts．
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