Warming up、Pre-reading、Reading、Comprehending教学内容

Unit 2 Reading Step 1 Leading in

The four basic instruments for navigation: Sinan, Inch Astrolabe, Sextant and nautical map. Step 2 Discussing 1. How do you think seamen found their way before modern accurate methods of navigation were invented? 2. Which do you think was easier to work out: latitude or longitude? 3. Can you identify these early navigational instruments seamen used and explain how they are used? 4. Which ones do you think are still used today? Step 3 Reading and finding 1. Where do these materials come from? 2. What did the early navigator use to help them navigate? 3. What natural objects were used to assist the navigation? 4. Is it easier to measure longitude or latitude?

5. Do the astrolabe, the quadrant and the sextant mean the same thing? Step 4 Comprehending 1. Read the passage and answer the following questions. What is the use of a bearing circle,

astrolabe, quadrant or sextant? (

)

What is the use of a compass?

(

)

A.

To set the course of the ship

B. To measure the position of the ship

C. To measure the speed of the ship

D. To tell the time 2 Why are speed and time important in working out the longitude of a ship? 3 Why is the position of the sun and various stars useful for working out latitude? 4.Suppose you were a sea captain aiming to sail round Africa. Discuss in groups: 1) What skills would you seek in your sailors? 2) What problems would you anticipate for this journey? 5. Read the chart below and fill in your plans of action to deal with them. What would you do if :

Step6 Homework 1. Review this passage.

Plan of action