单项选择题

A．Quit smoking.
B．Loose weight.
C．Have a talk with the doctor.
D．Weigh himself frequently.
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单项选择题
A．They have more dishes to choose.B．They buy their meals at a lower price.C．They can choose the place to eat.D．They don’’t have to pay for a certain number of meals.
A．They have more dishes to choose.
B．They buy their meals at a lower price.
C．They can choose the place to eat.
D．They don’’t have to pay for a certain number of meals.
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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