单项选择题

A．At a laboratory.
B．At a bank.
C．In a classroom.
D．In a department store.
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单项选择题
A．Boss and secretary.B．Customer and salesman.C．Doctor and patient.D．Husband and wife.
A．Boss and secretary.
B．Customer and salesman.
C．Doctor and patient.
D．Husband and wife.
填空题
In order to encourage bowel health, older people are advised to choose foods that are naturally rich in______.
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