A . Find the secret of the desert.B . Turn the desert into good land.C . Plant trees in the desert.
(2)
Why is land becoming desert little by little?
A . Because plants can't grow there.B . Because there is not enough rain.C . Because people are doing wrong things.
(3)
Why are green plants very important to dry places?
A . Because they don't let the sun make the earth even drier.B . Because they don't stop the wind from blowing the earth away.C . Because they can not bring much water.
(4)
Which statement is TRUE?
A . Scientists are doing bad things.B . Rain is becoming less and less.C . Green plants can hold water.