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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His theories were so ______ that few could see what he was trying to establish.
A．logical
B．scholarly
C．theoretical
D．vague
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To prevent a repetition of this dreadful occurrence, we must discover the element in the food that was served.
A．unknown
B．toxic
C．kind
D．shameful
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