单项选择题

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

A．separate
B．compare
C．contrast
D．distinguish
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单项选择题
Neither Mr. Smith nor his children ______ taking part in the sports meet this year.
A．was
B．are
C．is
D．were
单项选择题
The road to the other side is shorter now ______ the tunnel through the mountain.
A．but for
B．because of
C．as for
D．as to
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