[ t] (picked), [ d] (remembered), [ əd] (sounded) are three allomorphs of the same morpheme expressing past tensein English.
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Acronyms such as NASA, OR UNESCO are words derived from the initials of several words; they are pronounced as the spelling indicates.
A. 对
B. 错
当飞机下降到( )米时,遵守“飞行关键阶段”的原则。
A. 1200
B. 1500
C. 3000
D. 5000
飞机地面移动前,应确认( )。
A. 所有浮动物品固定好
B. 舱门滑梯预位
C. 所有旅客坐好,系好安全带
D. 全部都对
占座行李放置在不妨碍旅客看见安全标识的座位上,其重量不得超过( )千克。
A. 75
B. 80
C. 85
D. 90
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