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
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单项选择题
In the respiratory process, the following action takes place:_______.
A．Diffusion of blood through capillary walls into air sacs
B．Exchange of alveoli and oxygen within air sacs
C．Diffusion of oxygen through the air sac and capillary walls into the blood
D．None of the above
单项选择题
Selma Shapiro had her nose straightened because she wanted_______.
A．to look her best
B．to find a new job in the neighborhood
C．to live a new life in other places
D．to marry very soon
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