单项选择题

Color-blind people often find it difficult to （）between blue and green.

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

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单项选择题
Although only of （）intelligence, this young man speaks three languages fluently.

A．average
B．middle
C．minor
D．high
单项选择题
If you suspect that the illness might be serious, you should not （）going to the doctor.

A．pick out
B．make out
C．give up
D．put off
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