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【题目】Many scientists have ________ that we will face more serious environmental problems if we can’t come up with solutions to deal with pollution.

A. looked out B. called out C. pointed out

【答案】C

【解析】句意:许多科学家指出如果我们不能提出解决方案处理污染,我们将会面对更加严重的环境问题。looked out小心,当心;called out 唤起,出动;pointed out指出。根据句意可知,这件事是由科学家们指出来的,故应选C。

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