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
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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
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单项选择题
His theories were so ______ that few could see what he was trying to establish.
A．logical
B．scholarly
C．theoretical
D．vague
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