《The environment》ppt33

共47张。课件包括单词、词组和重点练习，适合新课教学。

　　Module 5 Unit 2 The environment
　　Learning aims:
　　1. To gain some information about the environmental protection
　　2. To reinforce the skills of reading prehension and be familiar with some key sentence structures
　　Important points：
　　How to organize the important words and phrases into a position
　　Learning procedures：
　　Step One  Pre-reading
　　A rainforest is an area covered by tall trees with the total high rainfall spreading quite equally through the year and the temperature rarely dipping below l6℃. Rainforests have a great effect on the world environment because they can take in heat from the sun and adjust the ate. Without the forest cover, these areas would refleore heat into the atmosphere, warming the rest of the world. Losing the rainforests may also influence wind and rainfall patterns, potentially causing certain natural disasters all over the world．
　　In the past hundred years, humans have begun destroying rainforests in search of three major resources: land for crops, wood for paper and other products, land for raising farm animals. This action affects the environment as a whole. For example, a lot of carbon dioxide(二氧化碳) in the air es from burning the rainforests. People obviously have a need for the resources we gain from cutting trees but we will suffer muore than we will benefit.
　　There are two main reasons for this. Firstly, when people cut down trees, generally they can only use the land for a year or two. Secondly, cutting large sections of rainforests may provide a good supply of wood right now, but in the long run it actually reduces the world’s wood supply.
　　Rainforests are often called the world’s drug store. More than 25％ of the medicines we use today e from plants in rainforests. However, fewer than l％of rainforest plants have been examined for their medical value. It is extremely likely that our best chance to cure diseases lies somewhere in the world’s shrinking rainforests.
　　1. Rainforests can help to adjust the ate because they __________.
　　A. refleore heat into the atmosphere
　　B. bring about high rainfall throughout the world
　　C. rarely cause the temperature to drop lower than l6℃
　　D. reduce the effect of heat from the sun on the earth
　　2. What does the word “this” underlined in the third paragraph refer to?
　　A. We will lose muore than we can gain.
　　B. Humans have begun destroying rainforests.
　　C. People have a strong desire for resources.
　　D. Much carbon dioxide es from burning rainforests.
　　3. It can be inferred from the text that __________.
　　A. we can get enough resources without rainforests
　　B. there is great medicine potential in rainforests
　　C. we will grow fewer kinds of crops in the gained land
　　D. the level of annual rainfall affects wind patterns
　　4. What might be the best title for the text?
　　A. How to Save Rainforests
　　B. How to Protect Nature