本单元的写作要求是描写动物。关于动物的体裁有三种形式：
1. 说明文：介绍某种动物，可从动物形体、习性、特点等方面展开；
2．议论文：动物与人类的关系以及如何保护动物；克隆动物的利和弊；
3．应用文：建议信(如何保护动物；写信投诉人类对动物的伤害)，保护动物的演讲稿及倡议信等；保护动物的文章常常是首先说明现状，比如数量减少，分析造成的原因，然后提出一些可行建议。
黄金表达，教你如何营造亮点
1．说明缘由和背景的句式
(1)I'm writing to say something about ... and give some suggestions to improve ...
(2)As is known to all, the number of ... is reducing for the following reasons.
(3)There are many reasons accounting for that.
(4)Many hunters hunt and kill animals illegally for their skins and fur in order to make profits.
(5)As a result, the habitats of them are on the decrease.
(6)They are becoming endangered animals as a result of ...
2．提出建议的句式：
(1)First, the public should be educated to raise the awareness of protecting animals ...Besides, effective measures must be taken to ...
(2)It's time to do ...
(3)It is high time that ...
(4)It is a good idea to do ...
(5)We shall spare no effort to do ...
3．表达愿望的句式
(1)I would be grateful if you can take my suggestions into consideration.
(2)I think it necessary to call on all people to ...
(3)If everyone of us can contribute a little, it will make a difference to ....
(4)Only in this way can ...
