关于细胞结构与功能关系的描述中，错误的是（　　）

修改：在错的词下画一横线，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。

DearTom，

Howis everything going? I have favor to ask.Next week，I was going to a reception at the City Hall.As is expected，I'll meet some high school student and their teachers invitingfrom America.

Theonly problem is that because I'm not very good at small talks with people Idon't know.So I am worried that I will make a fool of myself but make othersembarrassing.I wonder if you would be kindly enough to give me some tips inwhat I can talk about with people from America.Are there any questions that youshould not ask?

Lookingforward to your early reply.

Yours

Li Hua

【环境保护】阅读材料，回答问题。

我国农村环境污染严重已经越来越受到广泛关注。农村面源污染是指农村生产和生活活动中产生的未经处置的液体的或固体的污染物，从非特定的地域，在降水和径流冲刷作用下，通过农田地表径流、农田排水和地下渗漏，进入受纳水体(河流、湖泊、水库、海湾)所引起的污染。

请根据农村面源污染的污染物的来源提出农村环境污染的防治措施。