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
Our research has focused on a drug which is so ______ as to be able to change brain chemistry.
A．influential
B．powerful
C．monstrous
D．rigorous
单项选择题
No hero of ancient or modern times can surpass the Indian with his lofty contempt of death and the ______ with which he sustained the cruelest afflication.
A．assent
B．fortitude
C．concern
D．reverance
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