单项选择题

Even if its economy continues to recover, the US is increasingly becoming a nation of p. timers and temporary workers. This ______work force is the most important trend in American business today.

A．durable
B．disposable
C．available
D．transferable
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Eating too much fat can ______ heart disease and cause high blood pressure.
A．attribute to
B．attend to
C．devote to
D．contribute to
单项选择题
It is hard to imagine that this apparently______ professor was a drugpusher.
A．respectable
B．respective
C．respectful
D．respirable
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