2016-2017学年高中英语 Unit 2 Sailing the oceans Section Ⅰ Warming up Reading-Prereading课件 新人教版选修9.ppt

Section Ⅰ　Warm up Reading—Pre-reading In pairs discuss these questions： 1．What is a navigator? 2．What is the difference between a navigator and an explorer? 3．Look at these famous people.Are they navigators or explorers? 答案：　1.A navigator explores new routes across the sea. 2．A navigator explores the sea；an explorer discovers new places on land. 3．Navigator；explorer；explorer Look at the pictures.Then answer the questions. 1．How do you think seamen found their way before modern accurate methods of navigation were invented? 答案：　They kept close to the shore used nature such as the sun wind，birds，tide etc，to help them，and used some of the instruments including a compass，astrolabe，etc. 2．Can you identify these early navigational instruments seamen used and explain how they are used? (1)___________________________________________ (2)___________________________________________ (3)___________________________________________ (4)___________________________________________ 答案：　(1)compass(in ancient China)　(2)astrolabe　(3)sextant　(4)sea/nautical/marine chart 3．Which ones do you think are still used today? 答案：　Sea charts are still used today. Read the text and choose the right answer according to the text. 1．When did early sailors have a practical method of measuring longitude? A．The 12th century.　 B．The 17th century. C．The 15th century. D．The 16th century. 答案：　B 2．What does seaweed look like when it is near land? A．It looks nice. B．It looks small. C．It looks fresh. D．It looks dark. 答案：　C 3．Where are we now when the North Star is along the horizon? A．At the equator. B．At the North Pole. C．At the South Pole. D．At sea. 答案：　A 4．From the reading we have learned____________. A．why early seamen wanted to sail the seven seas B．that there is useful information in an encyclopedia C．that early sailors went exploring the seas using their skills and simple instruments D．why latitude and longitude are important to plot a ship’s position 答案：　C 5．The main idea of this passage is about_