单项选择题

A．Silk worms.
B．Traders.
C．Textile manufacturers.
D．Silk weavers.
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单项选择题
A．It will be easy to understand.B．Students will be tested on all the material discussed in class.C．It will cover topics from a wide variety of academic fields.D．Students must complete all parts of it.
A．It will be easy to understand.
B．Students will be tested on all the material discussed in class.
C．It will cover topics from a wide variety of academic fields.
D．Students must complete all parts of it.
单项选择题
A．The decline would have no effect.B．The decline would affect only Europe.C．The decline would affect only America.D．The decline would have a global effect.
A．The decline would have no effect.
B．The decline would affect only Europe.
C．The decline would affect only America.
D．The decline would have a global effect.
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