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
He ______ that he has discovered a new planet.
A．permits
B．claims
C．classifies
D．confesses
单项选择题
As the clouds drifted away an even higher peak became ______ to the climbers.
A．visible
B．obvious
C．apparent
D．plain
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