单项选择题

The ______ of such I. Q. tests full of questions on American culture was not questioned at that time.

A．significance
B．validity
C．efficiency
D．justification
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单项选择题
She wanted desperately to turn the flower-painted china ______ on the apple-green door, and go through, but somehow she could not.
A．frame
B．pole
C．pan
D．knob
单项选择题
This park has more than 200 waterfalls that are 15 feet or higher. And 150 of them have never been mapped or photographed, says park historian Lee Whittlesey. Now that's a ______ to the size of Yellowstone.
A．proposition
B．hypothesis
C．ceremony
D．testimony
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