(
课件网) Unit 7 The natural world Reading Ⅱ 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. includes sizes to play (to)keep covers produces plenty of returns to 用括号中所给词的正确形式填空。 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 What is an ecosystem It includes all the living and non-living things in an area. Look! This is my cute fish tank. We can often see such s_____ ecosystems in an office or at home. It i_____ not only some fish but also plants. The n_____ things around, like the stones and water, are also part of it. Every time I see it, I feel r_____. mall ncludes elaxed on-living include 包括 including 包括……在内”，常和前面的内容用逗号隔开 我们小组包括汤姆和吉姆 Our group includes Tom and Jim. 他已穿戴好了，包括鞋子。 He was fully dressed, including shoes. It includes all the living and non-living things in an area. How much do they cover/ make up The ocean Wetlands Forests around 71% of the earth’s surface. 6% of the earth’s land area. nearly a third of the earth’s land area. Green spaces _____(≈ 45%) of the city’s built-up areas. cover/ make up about 45% 1.The big bed _____ almost half of her bedroom. A. cuts up B. puts up C. turns up D. makes up 2.尽管你迟到了可是你不应当编造借口。 Although you were late, you shouldn’t _____ _____ excuses. D make up make up 形成构成；编造；化妆 How important are they Each ecosystem has a role to play help keep the balance between all their member = play a role play a role 发挥作用；扮演角色 play an important role in ... ...
