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> Scientists have been worried for years about the ________ of air pollution on the earth's natur
Scientists have been worried for years about the ________ of air pollution on the earth's natur
题目简介
Scientists have been worried for years about the ________ of air pollution on the earth's natur
题目详情
Scientists have been worried for years about the ________ of air pollution on the earth's natural
conditions.
[ ]
A. effect
B. reason
C. account
D. cause
题型:单选题
难度:中档
来源:同步题
答案
A
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A dog's________to his master
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题目简介
Scientists have been worried for years about the ________ of air pollution on the earth's natur
题目详情
conditions.
B. reason
C. account
D. cause
答案