问题
选择题
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
答案
答案：A
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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
答案：A