课件65张PPT。Unit 3 Under the sea“The noise made by boats of whale watching tourists may be causing communication problems for the animals，” British researchers said last week. Whale watching is a popular tourist activity in places where groups of killer whales live.Every day，dozens of boats filled with tourists go to watch the beautiful animals.Unfortunately，the engines of the boats make a lot of noise，and that may be causing problems for the whales，according to a report in the US science magazine Nature.话题导入 The whales travel in groups，and communicate with each other through sonic(声波的) calls that some scientists refer to as singing.The sounds of the boat engines may be creating too much background noise for the whales to be able to hear each other. The researchers listened to recordings of whale calls made between 15 and 25 years ago，before whale watching became popular.These were compared to more recent recordings. They found that the animals have started to sing for longer than they used to，like a person shouting to a friend across a noisy room.It is believed that the whales are trying to communicate hunting or breeding information.Scientists said that，if this is prevented，the future of the world’s whale population could be in danger，since the noise may be drowning out important communication about mates(配偶) or food. “Animals become slow in mind and repeat themselves in noisy areas，” said Volker Deecke，a Canadian biologist.“They have to say things twice or three times in order to be understood.”The killer whales studied were living off the coast of northwestern America.The number of killer whales in this area has been falling for several years，but scientists are not sure why.1.What does the word “breeding” mean according to the context? It means “ ”. 2.What does the passage mainly tell us? The passage mainly tells us . 3.Why do whales sing? .根据上文完成下列各题producing young animals/whalescommunication problems of the killer whalescaused by whale watchingTo communicate with each other./To communicate hunting or breedinginformation基础自测 课文预读内容索引要点探究当堂达标Period One Warming Up，Pre--reading & Reading基础自测1. adj.每年的；按年度计算的 n.年刊；年鉴 adv.每年；按年度计算 2. vt.当场见到；目击 n.目击者；证人；证据 3. n.住所；住宿 v.容纳；向……提供住处Ⅰ.重点单词annualannuallywitnessaccommodationaccommodate4. prep.在……对面 adj.相对的；相反的 5. vi.& n.暂停；中止 6. vi.逃避；逃跑 vt.逃离 7. vt.拖；拉；扯 8. n.深(度)；深处 adj.深的 adv.深地 adv.深深地oppositepausefleedragdepthdeepdeeply9. vt.催促；极力主张；驱策 10. vt.放弃；遗弃；抛弃 adj.被抛弃的 11. n.关系；血缘关系；交往 n.关系；亲戚 12. n.保存；保护abandonabandonedrelationshiprelationconservationurgeⅡ.重点短语1. 整理；分类 2. 及时 3. 瞄准；针对 4. 在此期间；与此同时 5. 举起；支撑；耽搁 6. 帮助(某人)摆脱困境或危难sort outin timeaim atin the meantimehold uphelp (...) outⅢ.重点句式This was the call that announced there . 这是宣告捕鲸行动马 ... ...
