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
单项选择题
Your wish to go for a walk does not ______ your leaving the baby alone in the house.
A．rectify
B．notify
C．signify
D．justify
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