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
She remains confident and （）untroubled by our present problems.

A．indefinitely
B．infinitely
C．optimistically
D．seemingly
单项选择题
The （）cycle of life and death is a subject of interest to scientists and philosophers alike.

A．incompatible
B．exceeding
C．instantaneous
D．eternal
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