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：許多科學(xué)家指出如果我們不能提出解決方案處理污染，我們將會(huì)面對(duì)更加嚴(yán)重的環(huán)境問(wèn)題。looked out小心，當(dāng)心；called out 喚起，出動(dòng)；pointed out指出。根據(jù)句意可知，這件事是由科學(xué)家們指出來(lái)的，故應(yīng)選C。
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