单项选择题

To prevent a repetition of this dreadful occurrence, we must discover the ______ element in the food that was served.

A．unknown
B．toxic
C．kind
D．shameful
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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
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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