单项选择题

The exploration of outer space is a great (triumph) of modern science.

A．superior
B．symbol
C．succession
D．success
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单项选择题
The Department of Resources notified the town council that the water supply was (contaminated).
A．cut
B．dangerous
C．diverted
D．polluted
单项选择题
The development of the transistor and integrated circuits revolutionized the electronics industry by allowing components to be packaged more (densely).
A．compactly
B．inexpensively
C．quickly
D．carefully
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