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
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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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