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
Anold Brown changed his name because_______.
A．there was racial discrimination in employment
B．Brown was just the same as Braunowiitz
C．it was easy to write
D．Brown sounds better
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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