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题目内容
（国家开放大学开放英语）
Thegovernmentiscarryingoutanti-desertificationprojects,includingthecreationofaforestbeltarounddeserts.thetree-plantingcampaign,knownasthegreatgreenwall,ismeanttoprotectbeijingfromsandstorms.chinahopestocontrolthe
expansionofdesertlandbytheyear2010andplanstoestablishaprotectedeco-systemindesertareasby2050
expansionofdesertlandbytheyear2010andplanstoestablishaprotectedeco-systemindesertareasby2050
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