单项选择题

21（）

A．centered
B．depended
C．based
D．acted

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It suddenly （）him that he should solve the problem with a computer.

A．occurred to
B．struck at
C．hit on
D．dawned in
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Color-b1ind people often find it difficult to （）between blue and green.

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