(
课件网) Unit 6 The natural world Unit 7 Reading 2 学习目标 通过本节课的学习，同学们能够: 1.运用略读、寻读等阅读技巧,快速从文本中找出海洋、湿地、森林的面积占比等关键信息。 2.认识到保护海洋、湿地、森林是全人类共同的责任，理解不同国家和地区在生态保护方面的共同追求。 3.熟练掌握核心词汇并运用 “It covers...”“They help...by...” 等句型来介绍生态系统的特征和作用;能够用英语简单复述三大生态系统的 主要信息,在小组讨论中清晰表达自己对生态系统的认识。 The big three: oceans, wetlands and forests An ecosystem _____(include) all the living and non-living things in an area. Ecosystems can be of different _____(size), from small ponds to large grasslands. Each ecosystem has a role _____(play) and helps _____(keep) the balance between all its members and the greater environment. The ocean is a very large ecosystem on earth. It _____(cover) around 71% of the earth’s surface and _____(produce) about 70% of the earth's oxygen. It holds _____(很多) salt water, and the water rises to the sky, falls onto the land and then _____(返回到) the ocean. This goes on and on, so the ocean is just like the “heart” of the earth. Review 根据短文内容用所给出的词适当形式或汉语意思填空 includes sizes to play (to)keep covers produces plenty of returns to Wetlands only cover about 6% of the earth’s land area. But they _____ (是……家园) about 40% of all the types of plants and animals. Plants in wetlands help _____(清除) pollution and make the water clean. Wetlands can also help _____(prevent) floods. During heavy rains, wetlands _____ (储存) water like giant sponges. They act like the “kidneys” of the earth. Forests _____(占据) nearly a third of the earth’s land area. Plants there _____(吸收) carbon dioxide from the air and produce oxygen. They also trap _____(harm) things in their leaves and help clean the air. _____(因此), people often call forests the “lungs” of the earth. Each of these ecosystems supports _____(数百万) plants and animals. They keep the planet healthy and make our world a better place. are home to (to) get rid of (to)prevent store make up harmful take in Therefore millions of 1.An ecosystem includes all the living and non-living things in an area. 生态系统包括一个地区的所有生物和非生物。 include 动词，意为“包括”，强调一个整体包含着若干个独立部分,或者一个东西包含着另一个东西的一部分。 including 是include的动名词形式,但通常独立用作介词,意为“包括……在内”，常和前面的内容用逗号隔开。 【对点练习】 1.Our group _____ Tom and Tim. There are altogether 8 students. A. included B. includes C. including D. include 2.Ten friends went to her birthday party, _____ (include) me. Language points B including 2.It covers around 71% of the earth‘s surface and produces about 70% of the earth’s oxygen. 它覆盖了地球表面约71%的面积，产生了地球上约70%的氧气。 around 作副词,意为“大约”，用于表示数量、时间、年龄等的不确切或近似数。 around 还可以作介词，意为“在……周围”。 look around 意为“环视；向四周看”。 【对点练习 ... ...
