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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The terrible noise is ______ me mad.
A. turning
B. setting

C. driving

D. putting
单项选择题
He has just () to a letter from a friend of his in Japan.

A. answered
B. offered
C. returned
D. replied
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