Question

【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

Answer 1

【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。