单项选择题

This remarkable technology provides far greater clarity than conventional x-ray.

A．accuracy
B．precision
C．degree
D．correctness
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单项选择题
On one Saturday afternoon, a man entered the shop to express his gratitude.
A． Right
B． Wrong
C． Not mentioned
单项选择题
A．oughtB．addedC．usedD．led
A．ought
B．added
C．used
D．led
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