【人教课标选修9】Unit 2 Sailing the oceans

I Comprehending

Read the passage and answer the following questions .

1 . 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 ?

II Learning about language

Do exercises 1 . 2 and 3

Exerise1  Replace the words underlined by ones of similar meaning form the reading passage .

1.       Seeing the dark clouds above him , George hurried for home .

2.       Sailing a boat alone far away form the shore made Flora’s parents worry about her safety .

3.       Clare , would you please put your bicycle next to the others in the shed ?

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