Animals are our friends. We can find1different kinds of animals. Some animals are living 2 big woods(森林). And some animals are living with 3. Animals are very4 to people. People can teach the elephant to do some heavy 5. And they can also teach the dog to 6the house. A watch dog is very 7 It can help people in danger(危险). So people 8dogs very much. Most of9like to go to the zoo.10there are many animals in zoos. Zoo is a good place for children to get to know animals.

①对于任意的x∈0，e，总有f（x）≥0；

②f（e）=e；

③若x₁≥0，x₂≥0，x₁+x₂≤e，则恒有f（x₁+x₂）≥f（x₁）+f（x₂）．

假如你是王磊，现在是周六上午十点钟。请你根据下面的提示跟你的朋友吴海写信描述一下你们全家正在做什么。

提示：1. How many people are there in your family? Who are they? 2. What are they doing? 3. What are you doing? 4. ……

要求：1. 语句通顺、逻辑连贯；2. 60词左右（信件格式已给出，不计入总词数）。

Dear Wu Hai,

……

                                                                                                  Yours,

                                                                                                  Wang Lei