单项选择题

A) estimates C) principles
B) regulations D) practices

A．estimates
B．regulations
C．principles
D．practices
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单项选择题
A) in addition C) therefore B) what's more D) however
A．in addition
B．therefore
C．what's more D) however
单项选择题
A) modern C) small B) advanced D) beneficial
A．modern
B．advanced
C．small
D．beneficial
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