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.
囧研究:女人刮“胡子”青春常驻!
禁止裸睡 美国奇葩法律大全
有钱任性 沙特新国王发210亿镑红包
买二手手机成名人 “橘子哥”红遍中美网络
过年习俗:从小年到元宵
研究:英式英语比法语更性感
睡姿透露你们的情感状态
莎翁语言造诣不如说唱歌手?
正能量教学 网络的正确打开方式
狗狗能看出你是生气还是快乐
寻找superstar:小贝等超星阵容宣传片
科学告诉你:屏奴时代已经来临!
《万物理论》:关于霍金的儿女情长
互联网时代的劳资之争
奥巴马幽默拜年:山羊绵羊都要快乐
美国证交会向阿里巴巴索取信息
今天是我一生中最好的一天
面试中可能遭遇的奇葩问题
英国女孩“嫁”给亚马逊土著
国际英语资讯:South Sudan leader urges security agencies to combat crime
奥斯卡礼袋:不仅奢华,而且奇葩!!
涨姿势 看世界各地华人如何过春节
科学家向外星文明发送维基百科
囧研究 你逗我呢上网交友能减肥?!
小心“会偷听的电视”
一张“遗愿清单”扭转生活
科学家成功使人体细胞“返老还童”
荷兰设计师在香蕉皮上作画
哈佛商学院正式推出在线课程
主人为汪星人举办奢华婚宴
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |