单项选择题

A) chain C) part
B) variety D) kind

A．chain
B．variety
C．part
D．kind
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单项选择题
A) cause C) contributeB) add D) devote
A．cause
B．add
C．contribute
D．devote
单项选择题
A) as a result C) for exampleB) however D) furthermore
A．as a result
B．however
C．for example
D．furthermore
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