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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单项选择题
Owing to a an ______ lack of lower-income housing, the municipal government is embarrassed by the impressing housing issue.
A．acute
B．stressful
C．demanding
D．urgent
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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