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
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单项选择题
To prevent flooding in winter the water flowing from the dam is constantly ______ by a computer.
A．graded
B．managed
C．conducted
D．monitored
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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