题目内容

一直达列车即从始发站到终点站中间不停靠的列车，车次前冠以字母_____。

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The word "knight" used to mean "youth", but now it means "a medieval gentleman-soldier". This is an example of______.

A. meaning-shift
B. widening of meaning
C. narrowing of meaning
D. loss of meaning

Which of the following is a back vowel？

A. [i:]
B. [i]
C. [a]
D. [u]

Among the following sounds, ______is a voiceless alveolar fricative.

A. [z]
B. [s]
C. [f]
D. [v]

乘坐国内航线旅游时，已满2周岁未满12周岁的儿童按成人票_____付费。