单项选择题

Some educator try to put students of similar abilities into the same class because they believe this kind of ______ grouping is advisable.

A．homogeneous
B．instantaneous
C．spontaneous
D．anonymous
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单项选择题
The magician made us think he cut the girl into pieces but it was merely an______
A．illusion
B．impression
C．image
D．illumination
单项选择题
54. He was punished ______ he should make the same mistake again.
A．unless
B．provided
C．if
D．lest
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