【題目】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：許多科學家指出如果我們不能提出解決方案處理污染，我們將會面對更加嚴重的環(huán)境問題。looked out小心，當心；called out 喚起，出動；pointed out指出。根據(jù)句意可知，這件事是由科學家們指出來的，故應選C。

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