Dear David,

    How are you? I'm fine. I'm in London, at the International School of English. I'm in Class 3 with eight other students.They're from different countries---Spain, America, and Thailand. Our teacher's name is Henry. He's very nice. He's a very good teacher.

    I'm living with an English family. Mr. and Mrs. Brown have three children. Tom is fourteen, Kate is twelve, and Andrew is seven. They are all very friendly, but it isn't easy to understand them.

    London is very big and interesting. The weather is good---cold but sunny---and the parks are beautiful! Hyde Park, and Green Park are all in the city center.

    English food is OK, but the coffee is very bad!

    Write to me soon.

Love

Paula

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；

      2）只允许修改10处，多者（从第11处起）不计分。

    In my view, the Internet is helpful. It is known to all, the Internet is playing important part in our daily life. On the Internet, we can read news home and abroad and got as much informations as we can. We can also attend to the net school and read many books. We can even do shopping online. Besides, your ability to operate the computer can be improved great. So we should not be addicted to the Internet, or we'll get our life and study destroying. In addition, we should keep off the harm websites. Anyhow, this doesn't prevent the Internet from becoming our friend.

某校生物科技活动小组建立了一个小型的农业生态园．在园内，同学们开展了一系列植物栽培和科学探究活动．请分析回答下列问题：

为了探究提高生态园内蔬菜产量的科学方法，同学们选择萝卜作为研究对象进行实验，他们在四个温室中分别种植了相同的萝卜种子，温室内的温度、二氧化碳浓度和土壤液控制情况如表所示（每个温室的光照等其他条件相同）：

   温室

         A

         B

         C

         D

   二氧化碳浓度

    0.03％

     0.1％

     0.1％

     0.1％

   温度

    20℃

     20℃

     30℃

     30℃

   培养液

    土壤浸出液

     土壤浸出液

     土壤浸出液

     蒸馏水

我国淡水鱼类中，被称为“四大家鱼”是（　　）