用方框中所给单词的适当形式填空 ,使短文正确、通顺,每词限一次 （cause ,deal ,great,space ,
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The population problem is one of the （greatest）problems of the world today .China has the largest population （of）1.3 million .It’s about one（fifth）of the world’s population .If the population grows too fast ,it （will cause）many serious problems .For example ,people will not have（enough）food to eat or enough houses to live in .The traffic will be （heavy）.People will cut more trees and there will not be enough （space）to stand in .How to（deal）with these serious problems China has （carried）out one-child policy to control the population and it has worked very well ,but we still have a long way （to go）
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