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．Sea resources decline more rapidly than other resources.B．Fishing is important to industry.C．Fish are an important food source.D．Fish are more threatened than other animals.
A．Sea resources decline more rapidly than other resources.
B．Fishing is important to industry.
C．Fish are an important food source.
D．Fish are more threatened than other animals.
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