单项选择题

What is the conversation mainly about

A．How to read the instructions.
B．How to use the cell phone.
C．How to pay the phone hill.
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单项选择题
A．He is old.B．He is in good health.C．He is in poor healt
A．He is old.
B．He is in good health.
C．He is in poor healt
单项选择题
The studies on stress in the early 1970s led to______.
A．popular avoidance of stressful jobs
B．great fear over the mental disorder
C．a careful research into stress related illnesses
D．widespread worry about its harmful effects
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