雅思写作题目：

Zoos are sometimes seen as necessary but poor alternative to a natural environment. Is it necessary to keep animals in zoos?

Some people think that zoos are cruel and all the zoos should be closed. However, other people think that zoos are useful to protect the rare animals. Discuss both views and give your own opinion.

从这篇文章的大标题why zoos are good就能直接看出这篇文章的主题---动物园的优点。

在文章首段段首In my view, it is perfectly possible for many species of animals living in zoos or wildlife parks to have a quality of life as high as, or higher than, in the wild.直接表明个人观点点明主旨,认为动物们在动物园或野生动物园能有和在野外一样或更高的生活品质。之后用解释法细节论述了动物在动物园里从饮食（a varied and high-quality diet），医疗(any illnesses they might have will be treated)及生存环境(a safe environment)的种种优势。段末重申自己的观点A lot of very nasty things happen to truly ‘wild’ animals that simply don’t happen in good zoos, and to view a life that is ‘free’ as one that is automatically ‘good’ is, I think, an error. 并用本段后一句话Furthermore, zoos serve several key purposes.简明引出下文内容。

第二段首句Firstly, zoos aid conservation.作为段落主题句指出作者认为的首个核心好处。之后的段落围绕动物园有利于动物爱护展开，先描述了爱护动物的背景colossal numbers of species are becoming extinct across the world, 然后指出圈养的好处（a species protected in captivity can be bred up to provide a reservoir population）。

第三段首句zoos also provide education. 作为段落主题句指出作者认为的第二个核心好处。之后具体化动物园的教育意义，并运用对比法（用电视纪录片及博物馆的标本和动物园里呈现的动物对比）突出动物园的优势。

第四段首句In addition to this, there is also the education that can take place in zoos through signs, talks and presentations which directly communicate information to visitors about the animals they are seeing and their place in the world. 承上启下表明本段是对上一段动物园教育意义的补充。

第五段首句zoos also play a key role in research.作为本段主题句指出作者认为的第三个核心好处。之后运用了假设论证（if we are to save wild species and restore and repair ecosystem we need to know about how key species live, act and react.）及举例论证（Finding about, for example, the oestrus cycle of an animal or its breeding rate helps us manage wild populations. ……）证明动物园在研究方面的价值。

文章后一段首句In conclusion, considering the many ongoing global threats to the environment, it is hard for me to see zoos as anything other than essential to the long-term survival of numerous species. 总结重申观点。之后概括全文主干描述的主要分论点，并用后一句话进行升华。

通过C14T4P2的Why zoos are good这篇文章基本很全面的概括了动物园的好处：

1 动物园在动物爱护方面的好处。

2 动物园在教育方面的意义。

3 动物园在科学研究方面的好处。