外研版 必修四 Module 6 Listening(共36张PPT).ppt

DR:__________, not all of them. The meteorite may have hit the earth with the such force that it created a huge ________, which stopped the sunlight from getting through …so there was no light, no heat, and no______. PRES: But other animals survived? Not exactly dust cloud food DR: Yes, _______ creatures like mammals, which may have survived because they ate _____________. PRES: What other theories are there? DR: Lots. The dinosaurs may have stopped_______ , and been unable to adapt to changes in the climate. Or they might have_______________. smaller nuts and seeds evolving killed each other PRES: Is that possible? DR: Oh yes. They spent a lot of time ________. There again, it might have been ________________, not a meteorite, which sent up clouds of dust and cut off the light. One very recent theory says they died of _______. fighting volcanic eruptions cancer PRES: Cancer? You mean the dinosaurs died out because they fill ill? DR: Yes. As a result of radiation coming from ___________ somewhere in our galaxy… PRES: That sounds fantastic. DR: Well, I think it’s unlikely, but it’s not impossible. a dying star PRES: Which theory do you believe? DR: I’d go for the_________. I think it’s the most likely one. And in fact there is a huge ______ in the Caribbean sea, off the coast of Mexico, where the meteorite may have landed… meteorite crater Module 6 Listening Grammar ---3. Summary “may + have + done”表示对发生过的 事情的推测，意思是“可能已经”或 “也许已经”，用于肯定句中。 —What has happened to George? —I don’t know. He may have got lost. —乔治发生了什么事？ —我不知道，他可能迷路了。 “might+have+done”表示对过去事情 的推测，might与may意思相同，但可能 性更小。多用于虚拟语气结构中。 He might have given you more help, even though he was busy. (MET90) 他或许会多给你一些帮助，即使他很 忙。 can (1). can可表示“条件许可” 相当于it is possible。 You can walk on the ice. 你能在冰上行走。 我们不能在这儿游泳, 因为有鲨鱼。 We can’t swim here on account of the sharks. (2). can也可表示偶然的可能性: 多佛尔海峡风浪可能很大。 孩子们有时很烦人。 The Straits of Dover can be very rough. Children sometimes c