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27. People have become aware ______the fact that carbon dioxide, poison to the environment, contribu

题目简介

27. People have become aware ______the fact that carbon dioxide, poison to the environment, contribu

题目详情

27. People have become aware ______the fact that carbon dioxide, poison to the environment, contributes_____ air pollution.

A．of, to

B．/, to

C．of, of

D．of, for

题型：单选题难度：偏易来源：不详

答案

A

略

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