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
According to the passage, some tornadoes take people unaware because they
A．produce a sound similar to thunder.
B．cannot be seen until it is too late.
C．look so much like other clouds.
D．carry so many large pieces of debris.
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