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.
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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
单项选择题
While air is in the lungs, it changes in the following way:_______.
A．Nitrogen is absorbed from the air
B．About one-fifth of the carbon dioxide and about one-half of the oxygen in the air goes into the blood
C．The moisture in the air is almost completely evaporated
D．About one-fifth of the oxygen in the air goes into the blood and an equivalent amount of carbon dioxide enters the air from the blood
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