单项选择题

During the process, great care has to be taken to protect the ______ silk from damage.

A．sensitive
B．tender
C．delicate
D．sensible
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单项选择题
John doesn t believe in ______ medicine; he has some remedies of his own.
A．standard
B．regular
C．routine
D．conventional
单项选择题
Vitamins are complex ______ that the body requires in very small amounts.
A．matters
B．materials
C．particles
D．substances
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