Sandstorms，strong and dry winds 1.that carry sand，have struck some Asian countries for centuries.As a result of desertification，sandstorms in China seem 2.to have increased(increase) in recent years.This is a process that happens 3.when land becomes desert because of climate changes and 4.because people cut down trees and dig up grass.Northwest China is part of the sandstorm centre in Central Asia.Sandstorms sometimes have 5.a very bad effect on Beijing,6.especially(especial) on its weather and traffic.To solve the problem，many ways have been tried.For example，in order to stop the desert,7.which is only 250 km away to the west，8.coming(come) nearer to Beijing，the government is planting trees.So far，over 30 billion trees 9.have been planted (plant) and 10.more(many) trees will be planted for the next five years.

　　1

　　1have the strength to do有做……的力气/意志力

　　with all one’s strength尽全力

　　build up one’s strength增强体力

　　2strengthen v.加强，巩固

　　3strong adj.强壮的

　　(1)I don’t have the strength to climb any further.

　　我没有力气再往上爬了。

　　(2)He has been doing morning exercises to build up his strength.

　　他一直进行晨练以增强体力。

　　(3)At present America is taking some measures to strengthen the economy.

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