单项选择题

The general idea of the passage is about______.

A．a diagnosis of lung cancer
B．the development of lung cancer
C．a new technique to detect lung cancer earlier
D．lung -cancer mortality
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单项选择题
John Waston was refused a job in the caf6 because of______.
A．his sex
B．his age
C．his past experience
D．his beard
单项选择题
American corporations are
A．free from international competition.
B．immune to industrial consolidation.
C．under the intense pressure of international c
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