单项选择题

Color-blind people often find it difficult to （）between blue and green.

A．separate
B．distinguish
C．compare
D．contrast

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单项选择题
He spoke confidently, （）impressed me most.

A．so that
B．that
C．it
D．which
单项选择题
There is no point （）the piano, unless you practice every day.

A．to learn to play
B．in learning to play
C．by learning to play
D．having learned to play
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