—Look! The man is burning the plastic. Let's ______ him. —OK. He should know air pollution is one of the ______ proble

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1. —Look! The man is burning the plastic. Let's ______ him.
—OK. He should know air pollution is one of the ______ problems in the modern world.

A . stop; extra B . encourage; extra C . stop; major D . encourage; major

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牛津版（深圳·广州）初中英语九年级上册期末测试卷（一）