Warming up、Pre-reading、Reading、Comprehending第二课时教案

Book 9 unit 2 教学设计

Part I Warming up: Can you identify these early navigational instruments seamen used and explain how they are used?

1) compass ( in ancient China)

2) astrolabe

3) sextant

4) sea / nautical / marine chart

Part II Reading: Step I Type of writing and summary of SAILING THE OCEAN

Type

SAILING THE OCEAN

How did the seamen navigate so well?

Using nature to help:

Using navigational instruments to help:

Step II

Read the passage again and fill in the blank: Using nature 1. To find the ship’s position at sea a sailor used the North Star and the sun.

2. A sailor knew that land was nearby if he saw_______________________________________.

3. Sailors used ___________________ ________to increase their speed.

Using instruments

There were two methods to find longitude:

1.________________________________________________________________ 2.________________________________________________________________ There are 4 methods to help find latitude

1._______________________________________________________________ 2.________________________________________________________________ 3.________________________________________________________________ 4.________________________________________________________________

Write down the working principles of the following instruments:

Bearing circle:_____________________________________________________

Astrolabe:________________________________________________________

Quadrant:_____________________________________________________________

Sextant:_______________________________________________________________

Step III 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

Step IV Read the passage and decide whether the following statements are true (T) or false (F).

1. An early method of calculating longitude was to use a knotted rope tied to a log.

2. The astrolabe was the first instrument to measure the sun’s 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 astrolabe, quadrant and sextant are different kinds of navigational

instruments and they have nothing to do with each other.

Part III After- reading

Discussion: Imagine you are on a boat with twenty-nine other people. You have a small box for your personal things but it can only hole ten items. What would you need for a week’s journey across the North Sea to England?

Part IV Homework 1. Review this passage.

2. Preview Learning about language.