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Science
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Which of the following is greenhouse gases?
Single Choice
Which of the following is greenhouse gases?
A.
Carbon dioxide
B.
Fluorinate [FLOOR-in-ate] gases
C.
Methane
D.
Nitrous oxide
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[单选题] Bok globules are visible in the Orion Nebula. What does this imply is occuring in the star?
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[单选题] Which of the following is not a primary energy source?
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