单项选择题

Conventional X-rays mainly show the difference between _________.

A．bone and air
B．liver and pancreas
C．muscle and other body
D．heart and lungs
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单项选择题
We can infer from the passage that the author does not regard a world becoming smaller and smaller a(n) _________ idea.
A．wonderful
B．bad
C．original
D．wrong
单项选择题
What does the author mean by passive enjoyment in the last paragraph
A．We do nothing at all.
B．We accept whatever the TV tells us as truth.
C．We are content with second-hand experience and do not go into the world itself.
D．We do whatever the stars in TV programs tell us to do.
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