单项选择题

A．They reduce a person’’s appetite.
B．They make a person less persistent in face of trouble.
C．They make a person’’s nervous system weak.
D．They make a person more vulnerable to disease.
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单项选择题
A．Just so so.B．Quite good.C．Fewer than other jobs.D．None of them know the salary.
A．Just so so.
B．Quite good.
C．Fewer than other jobs.
D．None of them know the salary.
单项选择题
A．Experimental medicines.B．Special treatment centers.C．Flexible working schedule.D．Innovative physical exercises.
A．Experimental medicines.
B．Special treatment centers.
C．Flexible working schedule.
D．Innovative physical exercises.
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