单项选择题

Questions 22～25 are based on the following conversation. What’s the special feature about the treated fibers

A．They can store heat.
B．They are thick.
C．They can absorb sweat.
D．They expand when heated.
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单项选择题
A．being developingB．developedC．developingD．being developed
A．being developing
B．developed
C．developing
D．being developed
单项选择题
In commerce a good salesman is one who ______.
A．does not waste his time on difficult customers
B．always has in stock just what you want
C．treats his customers sharply
D．sells something a customer does not particularly want
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