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

Although most universities in the United States are on a semester system which offers classes in the fall and spring, some schools（）a quarter system comprised of fall, winter, and summer quarters.

A. manipulate
B. stipulate
C. regulate
D. observe

单项选择题

She（）his invitation to dinner as she was on a diet.

A. inclined
B. declined
C. denied
D. disinclined

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