单项选择题


A．small
B．educational
C．big
D．business
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单项选择题
A．expensiveB．artificialC．educationalD．low-cost
A．expensive
B．artificial
C．educational
D．low-cost
单项选择题
A．comparedB．comparingC．contrastedD．contrasting
A．compared
B．comparing
C．contrasted
D．contrasting
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