单项选择题

Our research has focused on a drug which is so ______ as to be able to change brain chemistry.

A．influential
B．powerful
C．monstrous
D．rigorous
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单项选择题
The pursuit was ______ when it was clear that we had won the day.
A．called for
B．called forth
C．called off
D．called up
单项选择题
During the late 1950s, the Brazilian economy ______ forward as heavy industries and basic infrastructure—roads, communications, and construction—expanded.
A．increased
B．splashed
C．surged
D．improved
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