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
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单项选择题
Which of the following is Not true of the greenhouse effect
A．It will make chilly places better for agriculture.
B．Desert regions may receive more precipitation.
C．There would be less land on earth.
D．Some warm places would be cool.
单项选择题
The number of times per minute that you breathe is ______.
A．fixed at twenty-two times per minute
B．influenced by your age and sex
C．dependent upon the amount of fresh air available to you at any given time
D．controlled automatically by an unspecified body mechanism
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