单项选择题

With technological developments, some labor-intensive industries have ______ high-tech industries.

A．given up
B．stepped aside
C．stood along
D．yielded to
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单项选择题
The idea that machines could be made to fly seemed ______ two hundred years ago.
A．original
B．eccentric
C．terrific
D．splendid
单项选择题
Economic activity has been organized on the ______ of cheap and abundant oil from the beginning of the 20th century.
A．gist
B．notion
C．rationale
D．premise
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