单项选择题

Its mere arrival on the scene will not _________ a revolution in education or in politics.

A．secure
B．assure
C．convince
D．ensure
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单项选择题
This explains why even our most effective efforts to move people into jobs seem never to the welfare rolls.
A．squeeze
B．shrink
C．descend
D．decrease
单项选择题
_________ research is being done into the connection between the disease and poor living conditions.
A．Intensive
B．Expansive
C．Expensive
D．Extensive
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