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3.break out 突发；爆发 [高考例句](2017·重庆，阅读A)War broke out one evening. 一天傍晚战争爆发了。 break down毁掉；坏掉；(计划/谈判)失败 break up打碎；拆散；(会议)结束；分裂(解体) break off (使)停止；中断；折断 break into强行进入(某处) 单句语法填空/完成句子 ①Should another world war break ________，what would become of human beings? 万一另一次世界大战爆发，人类将会发生什么事？ ②We had to break ________ the house as we had lost the key. 因为我们弄丢了钥匙，所以我们不得不破门而入。 ③ [写作佳句] A fire ________________ in the lab，a lot of equipment was damaged. ＝After a fire ____________in the lab，a lot of equipment was damaged.实验室发生火灾后，很多设备被毁了。 答案 ①out ②into ③having broken out；broke out 特别提示：break out强调战争、疾病、火灾等的突然爆发，一般不用于被动语态。 [句 式 透 析] ※[教材原句] But when I tried to step forward，I found I was carried twice as far as on the earth and fell over. 而当我试着向前迈步时，我发觉我被送出去很远，步子的跨度竟是在地球上的两倍，因而我摔倒了。 倍数表达式： (1)倍数＋as...as... (2)倍数＋比较级＋than (3)倍数＋the size/height/length/width...＋of... (4)倍数＋what从句 单句语法填空/完成句子 ①They have three times as many cows ________ we have. | 
