单项选择题

While some bacteria are beneficial, others are ______in that they cause disease.

A．detrimental
B．prodigious
C．intrusive
D．mordant
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单项选择题
Harry vacuum cleaners work entirely by______.
A．suffrage
B．suction
C．suede
D．subtlety
单项选择题
Measuring skin fold thickness is considered to be an_____ method for estimating the amount of fat on one's body.
A．accessible
B．accountable
C．acceptable
D．adaptable
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