单项选择题

Fainting, or a temporary loss of consciousness, may be brought about by an insufficient supply of oxygen to the brain.

A．inappropriate

B．inadequate
C．unstable

D．undiluted

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单项选择题

A. educational institutions.
B. one’s social status.
C. the mass media.
D. public opinions.

填空题

The writer compares an officer to a car radiator cap to show that ______.