单项选择题

By dint of much practice, he became ______ and was able to sign his name with either hand.

A．practical
B．tricky
C．ambiguous
D．ambidextrous
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单项选择题
The concept of ______ grouping of people with similar interests and abilities was very popular among educators.
A．segregated
B．integrated
C．homogeneous
D．heterogeneous
单项选择题
Doctors in this hospital have successfully ______ 100 surgical treatments to remedy those suffering nearsightedness.
A．illuminated
B．plunged
C．administered
D．specified
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