单项选择题
A.save
B.preserve
C.raise
D.retain
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单项选择题
A.applianceB.equipmentC.utilityD.facility
A.appliance
B.equipment
C.utility
D.facility
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单项选择题
A.formB.fashionC.wayD.method
A.form
B.fashion
C.way
D.method
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