题目内容
[ s ] (maps), [ z ] (dogs), [ iz ] (watches) are three allomorphs of the same morpheme expressing plurality in English.
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[ t] (picked), [ d] (remembered), [ əd] (sounded) are three allomorphs of the same morpheme expressing past tensein English.
Acronyms such as NASA, OR UNESCO are words derived from the initials of several words; they are pronounced as the spelling indicates.
当飞机下降到( )米时,遵守“飞行关键阶段”的原则。
飞机地面移动前,应确认( )。
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