单项选择题

This discovery of the New World is ______ to the Italian navigator Christopher Columbus.

A．indebted
B．contributed
C．owned
D．attributable
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单项选择题
His account of his experience in Antarctic cannot be dismissed as ______.
A．unfair
B．incredible
C．unpractical
D．credulous
单项选择题
In cubism, natural objects are ______ analytically into geometrical shapes.
A．broken down
B．run down
C．cut down
D．torn down
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