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【单选题】

People have different opinions about ______.
A.why the concentration of gas is rising steadily

B.to what degree the greenhouse effect can affect us
C.whether CO2 has anything to do with the greenhouse effect
D.what measures should be taken to lower the carbon dioxide levels
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根据网考网移动考试中心的统计,该试题:

0%的考友选择了A选项

88%的考友选择了B选项

6%的考友选择了C选项

6%的考友选择了D选项

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