单项选择题

The city is an important railroad ______ and industrial and convention center.

A．conjunction
B．network
C．junction
D．link
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单项选择题
These plastic flowers look so ______ that many people think they are real.
A．beautiful
B．comparable
C．natural
D．similar
单项选择题
Most nurses are women, but in the higher ranks of the medical profession women are in a ______.
A．scarcity
B．minority
C．minimum
D．shortage
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