问题补充:
单选题_________isagrowingworldproblem,andnowadaystheUnitedNationsanditsmembercountries_________hardtodealwithit.A.Desertification; are workingB.Desertified ; workedC.Desert; workD.Desertification; have worked
答案:
A解析第一空填:Desertification“沙漠化”,第二空考时态:句意是:沙漠化是日益严重的世界问题,现在联合国和成员国正努力对付它。用现在进行时,选A。
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