题目内容
（请给出正确答案）
[主观题]
After reading the passage, we may conclude_______.A．the author is worried about the greenh
After reading the passage, we may conclude_______.
A．the author is worried about the greenhouse effect
B．the author asks all of us to reduce the use of coal
C．the greenhouse effect is welcome as it is a mixed blessing
D．the greenhouse effect has affected our life now
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