单项选择题

Being colour-blind, Sally can't make a ______ betweeen red and green.

A．difference
B．distinction
C．comparison
D．division
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单项选择题
I only know the man by ______ but I have never spoken to him.
A．chance
B．heart
C．sight
D．experience
单项选择题
The team's efforts to score were ______ by the opposing goalkeeper.
A．frustrated
B．prevented
C．discouraged
D．accomplished
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