单项选择题

A．It’s on time.
B．It’s crowded.
C．It’s empty.
D．It’s late.
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单项选择题
What does the author intend to say by the example in the sixth paragraph
A．Nextel provides a different operation strategy.
B．GPS technology, is vital for tracking service.
C．Tracking service becomes a flourishing business.
D．Location service is abused by married people.
填空题
grocery
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