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
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单项选择题
Vitamins are complex ______ that the body requires in very small amounts.
A．matters
B．materials
C．particles
D．substances
单项选择题
His wife is constantly finding ______ with him, which makes him very angry.
A．errors
B．shortcomings
C．fault
D．flaw
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