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

The process by which carbon dioxide and oxygen are transferred does not depend on ______.

A．the presence of nitrogen in the blood
B．the muscles of the thoracic cavity
C．the flow of blood
D．the moisture in the air sac linings