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

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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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