The greenhouse effect comes into being because of too much _______ in space.

A. ozone
B. carbon dioxide
C. carbon oxide
D. oxygen
B
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科目:初中英語 來源:模擬題 題型:單選題

The greenhouse effect comes into being because of too much _______ in space.
[     ]
A. ozone
B. carbon dioxide
C. carbon oxide
D. oxygen

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