比一比，组词。

已____、己____

喝____、渴____

外____、处____

下列各式①m；②x+5=7；③2x+3y；④m＞3；⑤$\frac{2a+b}{x}$中，整式的个数有____ 个．

关于地球所处的宇宙环境的叙述，正确的是（　　）

C

    Hello! My name is Jack.I am from England.Now I am in China with my parents.I like China.I like Chinese food，too.I have breakfast at home.I eat an egg，some bread and porridge(粥) for breakfast.I don't like milk.I have no time to go home for lunch，so I have it at school.The lunch at school is very good.I often have noodles and dumplings.Noodles are my favourite food. Sometimes I have different foods for lunch.I eat rice，meat and vegetables.I always go home early in the afternoon.Then I do my homework.I have supper with my parents.Sometimes we go out to have dinner with our friends.We are happy in China.