单项选择题

What does the passage mainly discuss

A．The increase of private mail service.
B．A comparison of urban and rural postal services.
C．The development of government postal system.
D．The history of postage stamps.

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单项选择题A student may pay the least tuition if he studies________.

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B．at a public university
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单项选择题________danger, he took a knife along with him.

A．Expecting
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