人教版初三英语全册写作训练

1. 2013人教版初三英语作文教案及练习

一般来说“白化动物”的寿命，通常比正常动物平均寿命短。我们平常看到专的白色动物属有两种情况：
一是，正常的白色动物，其毛色由白色基因决定。物种在进化中，继承各种基因，当环境需要时，就凸现出来，以帮助物种延续，与环境相适应；如北方狼多为白色和灰色，热带多为黄色和斑点色，因为热带几乎没有白色环境，白毛动物极难生存；但是白色基因是存在的。
二是，“白化病”动物。这种病存在于各种动物中。白化病是一种常见的皮肤及其附属器官黑色素缺乏所引起的疾病，由于先天性缺乏酪氨酸酶，或酪氨酸酶功能减退，黑色素合成发生障碍所导致的遗传性白斑病。白化病为常染色体隐性遗传，常发生于近亲结婚的人群中。这类病人通常怕光，看东西时总是眯着眼睛。
两种动物的鉴别方法：
1、检查眼睛。白化病动物的眼睛瞳孔是红色的，虹膜为粉红或者淡蓝色。如果你的宠物正常物种眼睛是黑色或者棕色，而你的宠物毛为白色，且红眼睛大概就是白化病了。如实验用的小白鼠、大白鼠、红眼睛的大白兔等都是白化动物。
2、检查皮肤。扒开毛，看肤色，白化病一般肤色为粉红色或者乳白色，且干燥；容易得皮肤病。
3、最可靠的办法是基因鉴定。

2. 人教版九年级英语练习册第七单元作文

人教版九年级英语练习册第七单元作文 （1） 假如你是Linda，今年暑假你去了海南岛。请你写一封80词左右的英文信给Tom。说一说你的旅游尽力。信的开头和结尾已给出，但不计入总词数. 要点：1.海南岛是中国第二大岛 2.海南岛天气很热 3.在海南岛可以进行很多运动，如潜水，钓鱼，游泳，冲浪和划船 4.海南岛到处都是椰子树，海南岛还有很多甜水果 提示词：coconut palm tree(椰子树) Dear Tom I went to Hainan Island this summer holiday___________________________________________________________________________________________________________________________________________ Best wishes. Yours Linda 答案 Hainan Island is the second largest island in China, and it is famous for its summer scenery. It was really hot in Hainan Island in summer when we got there. But we could do a lots of sports in the sea to cool ourselves down. For example, diving, fishing, swimming, boating and so on. That was really excited! There were coconut palms in everywhere and you could taste many sweet fruits. Do you want to go to place like this? I really want to go to Hainan Island again! 翻译海南岛是中国的第二大岛屿，它以夏天的景色而闻名。闻名到达那里的时候真的很热，但是我们可以做很多水上运动凉快下。比如说，潜水，钓鱼，游泳，冲浪和划船等等。真的非常刺激！海南岛上到处可见椰子树，而且你也可以尝到各种甜水果。你想要去这样的地方吗？我是真的很想再次去海南岛啊！

3. 人教版同步练习册英语九年级第五单元作文

On the weekend I like to spend time in library. I like reading books. There are many people in the library, but it is very quiet. Nobody talks in the room, only the sound of page turning. I’ very interested in the space, so I read a lot of books about space. Recently, I read the book Martian. It is about an astronaut Mark left on the Mars alone, he did many things to keep himself alive. After 549 solar days his crew mates came back to take him home. Mark is very tough to survive in Mars, he is a big hero. In the library I can read so many story and see the bigger world. I like library.