单项选择题

Fiber-optic cables can carry hundreds of telephone conversations（）

A．homogeneously
B．spontaneously
C．simultaneously
D．ingeniously

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单项选择题

Governments today play an increasingly larger role in the （）of welfare, economics, and education.

A．scopes
B．ranges
C．ranks
D．domains

单项选择题

Parents have to learn how to follow a baby's behavior and adapt the tone of their （）to the baby's capabilities.

A．perceptions
B．consultations
C．interactions
D．interruptions

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