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·电子教育的优点 ·电子教育尤其方便大学生 ·电子教育在中国某些地区未能普及的原因 ·你的看法 E-education

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E-education E-education is beco......

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单项选择题
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
单项选择题
What will be the result of the greenhouse effect
A．The earth's temperature will change irregularly.
B．The amount of carbon dioxide will be reduced.
C．The global temperature will gradually increase.
D．Much more sunlight will be blocked by CO2.
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