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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

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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