单项选择题

Fiber-optic cables can carry hundreds of telephone conversations ______.

A．simultaneously
B．spontaneously
C．homogeneously
D．contemporarily
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单项选择题
The husband' s story and his wife' s story ______each other.
A．retract
B．contract
C．distract
D．contradict
单项选择题
Through microscopes people can see objects that are ______to the naked eyes.
A．invisible
B．invincible
C．incredible
D．impassable
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