(x What is a main idea of the passage? A Not being able to tell the difference between some colors is called color blindness. B Most color-blind people, especially 1 out of 12 boys, cannot tell red or green apart. C Although telling some colors apart is hard for some people, they can work around this small problem. x D Color blindness runs in the family, which means it is passed down from parents to children.
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B Most color-blind people, especially 1 out of 12 boys, cannot tell red or green apart.
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