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1、Book 9 Unit 2 Sailing the Oceans【学习目标】1. 透彻理解课文，掌握文中的基础知识，培养快速阅读，整体理解的能力。2. 弄清每个句子的结构和意思，合作探究文中出现的长难句子和语法现象。课前预习案【自主学习】-大胆试Task I Scan the text and choose the best answers.1. What is the main topic of this passage?A. The voyages of the travelers before the 17th centuryB. How to plot a ships position
2、 on a map C. How did ancient men navigate so wellD. Use nature to aid navigation2. How many navigational instruments are mentioned in search of longitude and latitude? A. 4 B. 5 C. 6 D. 73. What does the word “random” in “Finding latitude” stand for?A. organizedB. intentionalC. arbitrary D. planned4
3、. Without secure method of measuring longitude before the 17th century, the British sailors really knew_. A. how to estimate longitude using speed and timeB. how to measure speed involved throwing a knotted ropeC. how to count the knots as a ship advanced through the waterD. what to do deal with the
4、 compass to calculate longitude5. We can infer from the passage_. A. Earliest seamen explored the oceans since latitude and longitude made it possible to plot a ships position.B. Earliest sailors only used celestial bodies, the weather, and tides and currents to navigate.C. The first seamen began to
5、 use navigational instruments to find longitude instead of using nature.D. In history of sailing the oceans, man mainly used nature to sail before navigational instruments were made.6. Ancient navigators use navigational instruments to help them _A. find celestial bodies. B. predict the weather.C. e
6、xplore the sea. D. find latitude7. The author of the passage implies that the ancient navigators were _A. hard-working B. brave. C. intelligent. D. energetic 8. According to the passage, _A. the ancient accomplished navigators were able to use South Star to plot their positionsB. Sea birds could be
7、used to show the way to land when it was nowhere to be seenC. Wise seamen used the snows to direct their sailingD. The sextant proved to be the most accurate and reliable of these early navigational instruments Say True or False according to the passage.1. An early method of calculating longitude wa
8、s to use a knotted rope tied to a log.2. The astrolabe was the first instrument to measure the suns position.3. The quadrant was more precise and simplified than the astrolabe, but still had its shortcoming.4. Up till now, the most accurate and reliable navigational instrument is the sextant. 5. The
9、 astrolabe, quadrant and sextant are different kinds of navigational instruments and they have nothing to do with each other.6. Before modern instruments were invented, people hardly made any navigation.7. Early sailors could use the height of the sun to work out their latitudes.8. Seamen couldnt sa
10、il the sea without knowing latitude and longitude.9. Winds could accelerate sailing speed and they were always safe and easy to use.10. The compass always indicate the north Pole, and seamen could find the direction that the ship needed to go with its help.学法指导：第一步：学法指导：快速浏览时，注意查看每段的中心句。一般情况下，中心句就是该
11、段的中心意思。采用扫描式阅读(scanning)，进行有选择有目的的阅读。目的是寻找某些资料和信息，对于无关的部分可以忽略。要注意总结题目类型 （主旨归纳题 细节题 猜测词义 推理判断题）， 然后根据不同类型采用不同的做题方法。 务必在原文中划出关键句，标上题号。课堂探究案合作探究一Task II Group discussion and put the following phrases into English or Chinese.1.sail the ocean 16.航海仪器 2.很可能感到奇怪 17.measure longitude 3.plot a ships position
12、 18.每小时15度 4.任摆布; 在前毫无办法 19.tie to 5.keep alongside the coastline 20.复杂的数学用表 6.冒最小的风险 21.set a straight course 7.use celestial bodies 22.方向盘, 方位圆 8.北极 23.rather than a random course 9.at midday 24.星盘, 四分仪和六分仪 10.算出, 制定出, 锻炼 25.all-in-one tool 11.close by 26.与.相关 12.在远海 27.at sea 13.help identify the
13、 position 28.在海浪里起伏不定 14.加速 29.the updated version 15.tides and currents30.工作原理是以 合作探究二：Task III Analyze and translate the following sentences.1. So accomplished navigators were able to use it to plot their positions 翻译：_ 分析： 仿写：Judy is _ English teaching. (茱蒂擅长英语教学) 2. On a clear day especially dur
14、ing the summer the sailors could use the sun overhead at midday to navigate by翻译：_分析：仿写：I have no topics _ .(可写作). He is not the person _(可相处).3.Sea birds could be used to show the way to land when it was nowhere to be seen翻译：_ 分析：4. The number of knots that were counted during a fixed period of time gave the speed of the ship in nautical miles per hour翻译：_ 分析：5. Later, when seamen began to use the compass in the 12th century they could calculate longitude using complicated mathematical tables翻译：_
