Dealing with environmental pollution has proved to be intractable for more and m

游客2023-12-25 29

问题 Dealing with environmental pollution has proved to be intractable for more and more countries around the world.

选项 A、ostensible
B、undoubted
C、difficult
D、lethal

答案 C

解析世界上越来越多的国家的实践表明，环境污染问题难以应对。A项ostensible“表面的；宣称的”。B项undoubted“无需置疑的，确实的”。C项difficult “困难的”。D项lethal“致命的，危害性极大的”。

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