The Black Sea is facing ecological catastrophe as a result of pollution.A、threat

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问题 The Black Sea is facing ecological catastrophe as a result of pollution.

选项 A、threat
B、disaster
C、change
D、event

答案 B

解析这句话的意思是：由于污染造成的恶果，黑海正面临生态灾难。画线词catastrophe意为“灾难、灾祸”；disaster意为“灾难、灾祸”；threat意为“威胁、恐吓”；change意为“改变、变革”；event意为“事件、活动”。根据题意，答案为B。

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