14.Greenhouse effect _______. A)could melt the polar ice caps, which would cause disastrous flooding B)has reduced the heat of the sun in the lower atmosphere C)is the result of decreasing the amount of carbon dioxide D)is cooling down the earth because we’re putting pollutants in the atmosphere

14.Greenhouse effect _______.
A)could melt the polar ice caps, which would cause disastrous flooding
B)has reduced the heat of the sun in the lower atmosphere
C)is the result of decreasing the amount of carbon dioxide
D)is cooling down the earth because we’re putting pollutants in the atmosphere

出自：英语（专升本）

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