[語境展示]閱雙下面句子，并從a-c中找出與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.動身，出發(fā)      b.燃放(鞭炮等) ,使(炸彈等) 爆炸

c.使(警報)響起，拉響(警報)

[自我歸納]set off在以上各句中的意思分別為：

1 →；2 →；3→ 。

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