单项选择题

A．The man.
B．The woman.
C．Both of them.
D．None of them.
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单项选择题
A．They are studying why people expend calories.B．They are studying how long people should spend on exercising.C．They are studying what is the most important way of keeping fit.D．They are studying why some people get fat and others don’t.
A．They are studying why people expend calories.
B．They are studying how long people should spend on exercising.
C．They are studying what is the most important way of keeping fit.
D．They are studying why some people get fat and others don’t.
单项选择题
A．He would replace a machine.B．He would try to perfect his trade.C．He would have to abolish his skills.D．He would learn to supervise a machine.
A．He would replace a machine.
B．He would try to perfect his trade.
C．He would have to abolish his skills.
D．He would learn to supervise a machine.
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