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Green Plants and Deserts
Scientists are trying to make the deserts into good land again. They want to bring water to the deserts, so people can live and grow crops. They are learning a lot about the deserts. But more and more land of the earth is becoming deserts all the time. Scientists may not be able to change the deserts in a short time.
Why is more and more land becoming deserts? Scientists think it is the people who make more and more deserts. People do bad things to the earth.
There is little rain in some places of the world. But these places don't become deserts because some green plants are growing there. Green plants are important to dry places. Plants prevent the hot sun from making the earth even drier. Plants don't let the wind blow the dirt away. When rain falls, the plants hold the water. Without the plants, the land will become deserts much more easily.
(1)There is _______ in the deserts.
[
]|
A ．little sunlight |
B ．little rain |
|
C ．too many plants |
D ．so strong wind |
(2)More and more land is becoming deserts because _______.
[
]A
．people have done bad things to itB
．it has rained too muchC
．there are no people living thereD
．there is not enough sunshine(3)Scientists think that _______, crops can be planted there.
[
]A
．if there is enough water in the desertsB
．as soon as farmers go to the desertsC
．if there is a big city near the desertsD
．if the weather is good(4)The green plants can _________.
[
]A
．bring water into desertsB
．hold water and stop the land becoming too dryC
．make land into desertsD
．provide water for deserts(5)If there are no plants in a place, _________.
[
]A
．there is no rain thereB
．the land will become deserts soonC
．people won't have enough food to eatD
．the weather will be bad 查看习题详情和答案>>