单项选择题

A．Less than one year.
B．Four years.
C．Five years.
D．Ten years.
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单项选择题
A．Every person in thirty people has one.B．Exactly 105,000 people have car phones.C．There is one in every 30 cars.D．Every car in the State of Florida has one.
A．Every person in thirty people has one.
B．Exactly 105,000 people have car phones.
C．There is one in every 30 cars.
D．Every car in the State of Florida has one.
单项选择题
A．Exploration of the oceans.B．Sophisticated method.C．Satellite tracking technology.D．Measuring devices.
A．Exploration of the oceans.
B．Sophisticated method.
C．Satellite tracking technology.
D．Measuring devices.
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