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。错误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：在错的词下面划一横线，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；
2. 只允许修改10处，多者（从第11处起）不计分。
I just come back from Britain last week. I was luckily enough to be
one of the students from different countries to visit the UK from Feb.16 to
28. We paid a visit to many places of interests, like London, Oxford or
the Lake District. I learned much about British culture and history in
London, where was my favorite. I also liked Oxford, in which I saw much
more old buildings . The Lake District was beautiful, but it was pity
that it rained heavily when they were there. The most excited thing
for me in the Britain was that I made a lot of friends there.
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区棉铃虫成灾，造成重灾区棉花减产50%以上，有的几乎绝收。针对这一情况，我国有关专家精心研制，培育出转基因抗虫棉，使棉铃虫灾情得到有效控制。研究同时表明，被导入基因作物的具有长效杀虫作用的内毒素蛋白，在大规模消灭害虫的同时，也使害虫天敌的数量急剧下降；此外，内毒素蛋白不定期对土壤和水体中的无脊椎动物产生危害。有专家称，地球上现存天然基因正在不可避免地遭受“基因污染”。