单项选择题

A ______ heart beats around seventy-six times a minute.

A．delicate
B．formal
C．normal
D．peculiar
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单项选择题
He is of a ______ mood; he never finishes what he starts.
A．different
B．various
C．distinctive
D．variable
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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