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
The trouble seems to be that income tax is progressive, so that the richer you get, the less rich you are than ______.
A．what you think you ought to be
B．what you thought you ought to be
C．what you thought you should be
D．you think you ought to be
单项选择题
Most people spend far more of their leisure time with the mass media than in any other ______.
A．business
B．occupation
C．job
D．profession
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