单项选择题

A light sleeper is usually very ______ to any sound even as inaudible as the humming of a mosquito.

A．acute
B．keen
C．alert
D．immune
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单项选择题
Nobody yet knows how long and how seriously the shakiness in the financial system will the economy.
A．knock down
B．drag down
C．settle down
D．put down
单项选择题
Their ______ -- that their project under way was something entirely new proved to be untrue.
A．repetition
B．assumption
C．impression
D．comparison
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