一群蚂蚁群聚生活，个体之间有明确分工，同时通力合作，它们之间的关系是（  ）

已知x+y=3，xy=1，求代数式（5x+2）﹣（3xy﹣5y）的值．

读图回答下列问题。

（1）此图是我国的            河，它发源于             省，注入            海。

（2）山脉：①                ②                ③                。

（3）上．中．下游的分界城市是：a             b              。

（4）它面临的主要问题是什么？是什么原因造成的？你认为该如何解决？

____I am 73 years old. I often watch TV in my free time. Of all the programs, I like the news best. Through the TV, I can learn what is happening in our country and in the world. At seven every evening , I always sit in front of the TV.

____I am a grandma. I like Chinese traditional opera. From Monday to Thursday, I usually turn on the TV at half past seven. The programs from CCTV 7 are my best.

____I am a basketball fan. I like playing basketball very much. But I am too busy. So I have to watch it on TV. Every night, I watch the match till midnight. I am crazy about it , especially NBA.

____I am a housewife. I do the housework all day, I'd like to watch TV at night. I prefer to see soap operas like “Palace”, “Meteoric Garden” and so on. Because they can make me feel relaxed.

____I am the only son in the family. I am in Grade Five. I like cartoons best. I often watch cartoons on TV after doing the homework.

从所给的A、B、C、D、E选项中，选择正确的小标题。

A、  B、

C、   D、

E、