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[语境展示]阅雙下面句子,并从a-c中找出与1-3中的

1. A group of boys were setting off fireworks in the street.

2. JeiTy and I set off on foot for the beach.

3. Smoke from a cigarette will not normally set off a smoke alarm.

a.动身,出发      b.燃放(鞭炮等) ,使(炸弹等) 爆炸

c.使(警报)响起,拉响(警报)

[自我归纳]set off在以上各句中的意思分别为:

1 →;2 ;3

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