Biological diversity has never been so threatened as it is today as a result of the process of human civilization. The various forms of pressure created by human activity have destroyed natural balance, led to the deterioration of natural habitats, genetic erosion and the rarity, even disappearance, of a number of plant and animal species.
As the pace of civilization accelerates, more people, taking more space, needing to use more natural resources, engaging in ever-growing consumption, impose severe deterioration on the habitat of animals. An increasing number of people come to realize that the disappearance of animals will result in serious threat to the equilibrium of ecosystem. Simply put, the extinction of hawks, a rat-eating bird seen in many regions, will result in the rapid propagation of rats. And rats, further, will destroy the prairies and threaten the other animals like gazelles, zebras and others, who live on grass and green lands. The coexistence of animals and human beings creates perfect harmony and brings about the vividness to our planet.
It is hard to imagine what our world would be like without animals. Sociologists also point out that the disappearance of animals can cause social and economic problems. Animal trade, as a supporting sector to the world economy, was very active before. However, the situation is beyond control since animal trade is very profitable and alluring. Many species cannot escape the adversity of being killed.
Certainly, our diet cannot be without meat. There are living stocks, which can provide us with sufficient and nutritious produce. Therefore, we need not to resort to wild animals, especially the endangered ones. To protect animals is to protect our living environment. Every individual should join efforts to keep the diversity of animals.
牛人分享雅思口语的答题公式
恶补雅思短期内实现7分秘诀
上班族烤鸭分享雅思阅读的满分心得
首战裸考二战备考23天拿下雅思6.5分的详细经验
专访雅思奇女子冯静笑谈口语8.5分经验
雅思口语8.5分大牛分享的备考经验
从0到5.5 一个大专生的雅思备考的路程
一个半月拿下雅思7.5分备考经验
雅思考试7分备考心得口语备考
雅思听力8.5分考前不看美剧看英剧
雅思口语9分考生谈暑假备考的方法
一战雅思阅读满分的经验分享
40天自学雅思8分心得分享经验+资料
雅思8分考生的40天的自学心得
雅思口语7.5考生分享详细的备考经验
雅思考点介绍湖南大众传媒学院
雅思牛人经验谈脱产复习 稳扎稳打拿高分
一战雅思7分备考经验感想
雅思7分考生分享阅读备考的心经
非牛考生的雅思7分复习的详细经验
三周备考拿下雅思听力8分的感想谈
雅思7.5备考经验点滴积累最重要
雅思听力7.5阅读8分的详细的备考过程
雅思总分7.5分听力9分备考经验
雅思总分7.5分学员备考的心得分享
雅思8分应考建议基础是才是决胜之道
雅思7.5分的一个半月复习的经验
雅思写作1个半月从6.5到7.5分的经验谈
雅思湖北大学考场经验的分享
雅思成都考场十条详细经验
| 不限 |
| 英语教案 |
| 英语课件 |
| 英语试题 |
| 不限 |
| 不限 |
| 上册 |
| 下册 |
| 不限 |