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

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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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