A:①②
B:②③
C:③④
D:②④
— Is she your ____ (mother, sister)?
— Yes. She is.
The policeman often helps the old woman walk _____________ the bridge.
某《英汉辞典》在解释“bus”时,列出的义项有①公共汽车②火箭的一级③火车车厢④公共马车,如果按照历史上这些含义出现的先后来写编写辞条,那么正确的排序应当是( )