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A．Living without an aim is like sailing without a compass.
B．A crowd of people were around him, touching his body, feeling his legs, and bidding for him as if he had been a horse.
C．He has a heart of stone and will of iron.
D．He is only as short as a 10-year old boy.
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，则在区间 ( ) 上
能取到最大值和最小值.
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