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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单项选择题

The concentration of carbon dioxide is caused by ______.

A．the heat accumulated in the atmosphere
B．the burning of coal
C．the wide use of renewable energy
D．the destruction of the tropical rain forest

单项选择题

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