Hi,
订阅
报纸
纸质报纸 电子报纸
手机订阅 微商城
英语
学习
诚博娱乐客户端 翻译协作
诚博娱乐客户端 国际学校
口语
演讲
精彩视频 名人演讲
演讲技巧 口语训练营
教育
资讯
新闻资讯 语言文化
备课资源 经验交流
用报
专区
中学Teens
小学Kids
21英语教师网 > 备课资源 > 拓展阅读 > 正文
Pieces of our planet
作者:21ST    来源:21诚博娱乐客户端    日期: 2012-09-24
外研版高二年级:Animals in Danger

关键词:Animals and their environment

话题归类:热点话题Topical issues
   
ECOSYSTEM refers to all the things that form the environment we live in and their relations. It includes the followings:

Atmosphere

The atmosphere covers the Earth. It is a thin layer (层次) of mixed gases that make up the air we breathe. This thin layer also helps the Earth from becoming too hot or too cold, much like clothing does for us. Weather systems, such as clouds, rain, and winds, which develop in the lower atmosphere, are driven by heat from the sun, the rotation (旋转) of the Earth, and variations (变化) in the Earth's surface.

Water

The biggest bodies of water on Earth are the oceans, covering about 70 percent of Earth's surface. Millions of living things live in the oceans. Fresh water, on the other hand, is very important for animals, plants and humanity on the land. Water on the earth also plays a important role in adjusting the temperature. The atmosphere and ocean constantly exchange energy and matter, during the cycle of the waters. For example, water evaporates (蒸发) from the oceans into the atmosphere. This moisture (湿气) then falls back to the Earth as precipitation - rain, snow, sleet, and even the morning dew (露水) on the grass.

Ice is the world's largest supply of freshwater. It covers the remaining 3 percent of Earth's surface including most of Antarctica and Greenland.

Land

Land covers 27 percent of Earth's surface. It is where we live and most of our food comes from.

Animals and plants

There are many other living things that share the Earth with humans. Huge numbers of animals and plants, both living on land and in oceans, play very important roles on the Earth.

Large quantities of carbon dioxide is exchanged between the animals, plants and the atmosphere as plants take in carbon dioxide and give off oxygen, and animals inhale (吸入) oxygen and exhale (呼出) carbon dioxide. They also provide food that support all the others in the system.
 



关键词:外研版 高二 Animals in Danger 热点话题 Topical issues
 打印


相关文章







 


Most Popular

 
热点翻译问题

 
 

标题
内容
关闭
内容
联系我们   |    广告业务   |   演讲比赛   |   合作伙伴   |   关于我们   |   手机访问   |   全站链接   
有意与本网站合作者,有关合作事宜请联系我们。未经21诚博娱乐客户端书面授权,请勿转载或建立镜像,否则即为侵权。
主办单位:中国日报社 Copyright www.i21st.cn All Rights Reserved 版权所有 复制必究   


诚博娱乐客户端