填空题

【参考答案】

have ∧ removed —been
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填空题
that —which
单项选择题
It can be inferred from the passage that ______.
A．the human eye is sensitive to all wavelengths
B．colors are related to wavelengths
C．there are more color-blind women than color-blind men
D．failure of rods cause color-blindness
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