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中国第一任常驻联合国代表是（）
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【简答题】As to the greenhouse effect，the author_____
【单选题】Greenhouse Effect A greenhouse is a building made of glass which is used for keeping plants warm when the outside temperature is low. In a similar way, there are several gases in the atmosphere which ...
A.
keep the plants warm.
B.
prevent air pollution.
C.
stop the greenhouse effect.
D.
produce useful gases.
【单选题】The greenhouse effect ______________________.
A.
is decreasing overtime and so is not an issue that scientists take seriously
B.
is clearly a negative phenomenon because it heats up the earth's temperature
C.
can be a positive phenomenon because it keeps the earth's temperature from being too low for life to exist, but can also be a negative phenomenon when too much greenhouse gas is stored in the atmosphere
D.
is clearly a positive phenomenon because without the greenhouse gases, the earth's temperature would be too cold for life
【简答题】If there were no greenhouse effect， ．
【单选题】According to the passage, which of the following is NOT TRUE about the greenhouse effect_______.
A.
Most of the greenhouse effect is caused by watr vapor in the atmosphere.
B.
Human beings hve little to do with the amount of water vapor in the atmosphere, thus playing no role in the greenhouse effect.
C.
Nitrous oxide also belongs to greenhouse gases which cause greenhouse effect.
D.
Without our atmosphere, there would be no greenhouse effect.
【简答题】The most abundant greenhouse gases are ______and______.
【简答题】The increase of greenhouse gases______________
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