There should be at least two lines in each windbreak.One line should be large trees.The second line，right next to it，can be shorter trees or other plants with leaves.Locally grown trees and plants are considered the best choices for windbreaks.Trees reduce the damaging effects of wind and rain.Their roots help protect soil from being washed away.And trees can provide animals with shade from the sun.

　　1．The advantages of building a windbreak are as follows EXCEPT

　　.

　　A．keeping the wind from destroying grain crops

　　B．increasing the production of grain harvests

　　C．providing humans with shade from the sun

　　D．reducing the damaging effects of wind and rain

　　2．The author thinks windbreaks are interesting because

　　.

　　A．the movement of air lifts the soil

　　B．windbreaks allow some wind to pass through

　　C．large trees are lined with short ones

　　D．windbreaks can stop the wind getting through

　　3．If the trees grow to a height of 30 feet，the areas the windbreak can protect are

　　.

　　A．100 square feet

　　B．150 square feet

　　C．240 square feet

　　D．300 square feet

　　4．What can be inferred from the text?

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