单项选择题

It was in the year 1999 （） John Smith found a way to send messages on the Internet.

A．in which
B．that
C．when
D．which

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单项选择题
This morning the newspaper had a very interesting （） on the population problem.

A．composition
B．article
C．work
D．publication
单项选择题
The （） of the Mississippi River is located more than two hundred miles from its mouth.

A．source
B．beginning
C．resource
D．origin
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