Which word is different from the other three in word formation?A．USA B．Flu C．AI

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问题 Which word is different from the other three in word formation?

选项 A．USA
B．Flu
C．AIDS
D．WTO

答案B

解析考查形态学知识。USA，AIDS，WT0都是首字母缩写词(acronym)，而Flu则是缩写词(abbreviation)。

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