_________ is a growing world problem, and nowadays the United Nations and its member countries _________hard to deal with it．

A．Desertification; are workingB．Desertified ; worked
C．Desert; workD．Desertification; have worked

A

解析第一空填：Desertification“沙漠化”，第二空考時態(tài)：句意是：沙漠化是日益嚴重的世界問題，現(xiàn)在聯(lián)合國和成員國正努力對付它。用現(xiàn)在進行時，選A。

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