单项选择题

Colour-blind people often find it difficult to ______ between blue and green.

A．separate
B．compare
C．distinguish
D．contrast
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单项选择题
Air, water and food is ______ to good health.
A．vital
B．convenient
C．important
D．sufficient
单项选择题
He interrupted me ______ by asking irrelevant questions.
A．continually
B．continuously
C．consistently
D．consequently
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