单项选择题

Harry vacuum cleaners work entirely by ______.

A．suffrage
B．suction
C．suede
D．subtlety
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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
单项选择题
The failure of the experiment to produce the expected result should alone be ______ to your carelessness.
A．contributed
B．ascribed
C．distributed
D．prescribed
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