单项选择题
A.permanent
B.constant
C.unique
D.essential
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单项选择题
A.such asB.for exampleC.for instanceD.like
A.such as
B.for example
C.for instance
D.like
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单项选择题
A.upB.inC.onD.about
A.up
B.in
C.on
D.about
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