单项选择题

Why does David go to Professor Smith for help

A．He missed all the classes last week.
B．He had trouble with today"s lecture.
C．He wanted to learn how to take notes.
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Who brought silk to Europe in the thirteenth century
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B．Marco Polo.
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What is the probable relationship between the speakers
A．Customer and waiter.
B．Doctor and patient.
C．Husband and wife.
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