新概念英语第二册53.ppt

Forest fires are often caused by broken glass or by cigarette ends which people carelessly throw away. cigarette ends 烟头 Yesterday the firemen examined the ground carefully, but were not able to find any broken glass. be able to 能够 ； They were also quite sure that a cigarette end did not start the fire. be sure that 对……很有把握； I am sure that he will come back soon. start a fire＝cause a fire start vt. 使……发生，引起 This morning, however, a firemen accidentally discovered the cause. However与but区别： However要接逗号，再加句子。 But直接与句子相连。 discover 偶然发现（某个已经存在的东西） invent 发明（以前没有的东西） He noticed the remains of a snake which was wound round the electric wires of a 16,000-volt power line. notice 注意别人没注意的东西 the remains表示“尸体，残骸”，必须用复数形式 wind vt. 1)vt. 缠绕，卷在……上（常与around/round连用） 你介意我把这段电线缠在树上吗？ Did you wind this piece of wire round the tree? In this way, he was able to solve the mystery. in this way 就这样 The explanation was simple but very unusual. A bird had snatched up the snake from the ground and then dropped it on to the wires. snatched up sth.from the ground从地上抓起来 drop vtvi.无意掉下去的,使落下,使掉落 茶壶从她手里掉了出来。 The teapot dropped out of her hand。 The snake then wound itself round the wires. When it did so, it sent sparks down to the ground and these immediately started a fire. do so 这么做 I refuse to do so. 我拒绝这么做 so常用于一些动词之后，代指前面提过的某个动作/某件事，以免重复 我也这样认为。 I think/believe so. start a fire=cause a fire 引起一场大火 Phrases by chance beyond one’s power in this way at last make a fire since then be able to find out 偶然地 某人力所不能及的 就这样 最后 生火 从那时起 能够 找出 Lesson 53 Hot Snake 触电的蛇 Listen and answer the question What caused the fire? At last firemen have put out a big forest fire in California. Since then, they have been trying to find out how the fire began. Forest fires are often caused by broken glass or by cigarette ends which people carelessly throw away. Yesterday the firemen examined the ground carefully, but were not able to find any broken glass. They were also quite sur