They began by cutting 1．5-inch-wide sections of tree bark from the branches of a white pine tree．The people related then tested the wood’s filtering ability by pouring water containing red dye particles of different sizes through．

　　52.their amazement, they found that it was effective in trapping all the articles．

　　53.（encourage）, the team conducted

　　54.experiment, this time with water that contained bacteria．Sure enough, the sapwood held back 99% of the bacteria, allowing only 1% to flow through．

　　、短文改错

　　假定英语课上老师要求同桌之间交换修改作文, 请你修改你同桌写的以下作文。文中共有10处语言错误, 每句中最多有两处, 每处错误仅涉及一个单词的增加、删除或修改。

　　增加：在缺词处加一个漏字符号（∧）, 并在其下面写出该加的词。

　　删除：把多余的词用斜线（）划掉。

　　修改：在错的词下划一横线, 并在该词下面写出修改后的词。

　　注意：1每处错误及其修改均仅限一词汇。

　　2只允许修改10处, 多者（从第11处记）不计分。

　　短文改错

　　When I was a child, I spent more than ten years learn the violin．Therefore．I couldn't understand “real music” After I graduated from high school, the friend of mine suggested that we started to learn the guitar because we all thought it was cool．I will never forget the day on that we went to buy guitars in the guitar store．Here I saw a guitar player playing the guitar, which I really enjoyed．He became my first guitar teacher．There were too many wonderful models to choose that it took me a long time to buy one Now the guitar is the most importantly part of my life and I practice it every day．

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