单项选择题

What do we know about silk today

A．It is very popular among painters.
B．It is much cheaper than in the past.
C．It is used by famous dress designers.
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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.
单项选择题
Who brought silk to Europe in the thirteenth century
A．Napoleon.
B．Marco Polo.
C．Leonardo da Vinci.
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