单项选择题

Do you want to fly first or______ class

A．savings
B．thrifty
C．economy
D．economics
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单项选择题
Some teachers claim that______ is necessary for children to be able to learn in school but others do not feel that leisure activity is all that important.
A．recreation
B．instruction
C．intelligence
D．diligence
单项选择题
The______ drinking of liquor is much less harmful than habitual use.
A．occasional
B．frequent
C．continual
D．constant
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