单项选择题

A．They should drink as much as they need.
B．They should drink eight glasses a day.
C．They should drink about two liters.
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单项选择题
A．Forty percent. B．Thirty percent. C．Fourteen percent.
A．Forty percent.
B．Thirty percent.
C．Fourteen percent.
单项选择题
A．Customer and salesman. B．Teacher and student. C．Doctor and patient. D．Boss and employee.
A．Customer and salesman.
B．Teacher and student.
C．Doctor and patient.
D．Boss and employee.
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