单项选择题


A．around
B．about
C．on
D．of
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单项选择题
A．effectiverB．effectiveC．more effectiveD．most effective
A．effectiver
B．effective
C．more effective
D．most effective
单项选择题
A．foundB．inventedC．createdD．discovered
A．found
B．invented
C．created
D．discovered
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