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April A
Dea......

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单项选择题
The greenhouse effect ______.
A．is a problem raised recently
B．has drawn extensive attention all over the world
C．is the warming caused by an increase of CO2
D．should be imputed to the well-developed countries
单项选择题
The author writes the passage to tell the reader ______.
A．what is the greenhouse effect
B．how serious the greenhouse effect would be
C．it is important to reduce the use of fossil fuels
D．how to change the greenhouse effect
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