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
How the writer started smoking shows the powerful influence of（）

A. educational institutions.
B. one’s social status.
C. the mass media.
D. public opinions.
单项选择题
It is easy to determine whether smoking is hazardous.（）

A. Right
B. Wrong
C. Not mentioned
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