单项选择题

A．Professor and student.
B．Doctor and patient.
C．Waiter and customer.
D．Clerk and customer.
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单项选择题
A high negative ion count is likely to be found________.
A．near a pond with a water pump
B．close to a slowly flowing river
C．high on some barren mountains
D．near a fountain
单项选择题
According to the author, the greatest problem with the young people is________.
A．they do not know what to do and how to do
B．they are spoiled by their parents
C．they have lost their own identity
D．they are too ambitious and less competent
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