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
None of us were ______ when Bill asked for help.
A．attainable
B．available
C．approachable
D．applicable
单项选择题
The food was divided ______ according to the age and size of the children.
A．equally
B．proportionately
C．sufficiently
D．adequately
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