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On average，there are 800 tornadoes in the US each year，causing about 80 deaths and 1，500 injuries. 平均来说，美国每年发生800次龙卷风，造成大约80人死亡，1 500人受伤。 12. (1)现在分词((短语))作结果状语常表示“意料、情理之中”的结果，这种分词的逻辑主语既可以是句子的主语，也可以是前边的整个句子；逻辑主语为前边的整个句子时，其作用相当于一个非限制性定语从句。 (2)不定式(短语)作结果状语常表示出乎意料的结果。 句型公式：现在分词短语作结果状语 (1)The child fell，striking his head against the door. 这个小孩摔了一跤，头在门上碰了一下。 (2)He hurried to the bus stop，only to find the bus had left. 他匆匆地去了车站，结果却发现车已离开。 (1)单句语法填空 ①A number of new machines were introduced from abroad， (result) in an increase in production. ②Anxiously，she took the dress out of the package and tried it on，only (find) it didn’t fit. (2)同义句改写 (将上题句①改为含有定语从句的复合句) 多维训练 resulting to find A number of new machines were introduced from abroad，which resulted in an increase in production. 答案 By the late 1890s，he had moved to Galveston，where he died in 1899，a year before the hurricane struck.到19世纪90年代末，他搬到了加尔维斯顿，于1899年在那里逝世，正是飓风袭击的头一年。 13. 句型公式： before引导时间状语从句 边讲边练 | 
