当前位置:首页 >> 英语 >>

book9-unit2-reading


UNIT 2

Arctic Ocean

Pacific Ocean Indian Ocean

Atlantic Ocean

Question: How many oceans are there in the world ?

the Arctic Ocean

>
the Atlantic Ocean

the Pacific Ocean

the Indian Ocean

early navigational instruments

compass

Astrolabe(星盘)

Sextant(六分仪)

sea/nautical chart

New words
encyclopedia exploration celestial horizon equator overhead knot log nautical

magnetic random awkward reference precise portable accurate secure theoretical

Read about what navigation was like before modern instruments were used.

Sailing the oceans
Page 1
Fast-reading How did seamen explore the oceans before latitude and longitude made it possible to plot a ship’s position?

Using nature
? Keeping alongside the coastline ? Using celestial bodies天体

? Using wildlife
? Using the weather ? Using the sea

Using celestial bodies

to plot the positions to work out the latitude a special cloud formation indicates there is land close by

Using wildlife

If seaweed was fresh and smelled strongly, the ship was close to land.

Sea birds could be used to show the way to land when it was nowhere to be seen.

Using the weather

To help identify the position of a stream or river when…

To direct their sailing

Using nature
Use the information to analyze the navigational skills and write the answers in your own words.

1.To find the ship’s position at sea a the North Star and the sun. sailor used _______________________. 2.A sailor knew that land was nearby if clouds , fresh seaweed, he saw__________________________ nesting birds or fog __________________________.
currents or tides and 3.Sailors used sea ____________________ winds to increase their speed. ______

Page 2
Fast-reading
What skills did sailors use to explore the seas and discover new lands?

Using navigational instruments
1. Finding longitude the compass 2. Finding latitude ? the bearing circle
(方位圆)

? the astrolabe (星盘) ? the quadrant (象限仪,四分仪) ? the sextant (六分仪)

Using instruments
Read again and fill in the blanks

There were two methods to find longitude: 1. __________________________ measuring time and speed
2.___________________________ compass and complicated

mathematical tables

Read the passage (Reading) 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. T 2. The astrolabe was the first instrument to measure the sun’s position. F 3. The quadrant was more precise and simplified than the astrolabe, but still had its shortcoming. T

4. Up till now, the most accurate and reliable navigational instrument is the sextant. F 5. The astrolabe, quadrant and sextant are different kinds of navigational instruments and they have nothing to do with each other. F

3.Why are speed and time important in working out the longitude of a ship?
Because the earth moves fifteen

degrees westwards every hour. If you know your direction, speed and time, you can work out the approximate longitude or change in your position
in relation to the stars.

4. Why is the position of the sun and various stars useful for working out latitude?
Because they are fixed points in the sky and their movements in relation to the earth are already known. So they can be used to measure a ship's position.

5 Write down the working principles of the following instruments: Bearing circle: to compare the height of the sun now with the position of the sun at midday. Astrolabe: to compare the position of the ship in relation to some stars or the sun

Quadrant: a more precise form of the astrolabe, to measure how high
stars are above the horizon, and

compare that measurement with
previous measurements (using

the ship as one of the fixed
points to find its position)

Sextant: an updated version of the quadrant and so it was more accurate, to measure the angle between two fixed points outside the ship (using two mirrors to find the ship's position).

.

Consolidation
how We may want to know (1)____seamen explored the oceans(2)_______ before latitude appeared. (3)_______they didn’t have the Though modern navigational help, seamen could still control the sea by using some skills to explore seas and discover the new lands. (4)______ Using (use) nature is the first and most useful form of exploration (5)_________(explore), such as using celestial bodies, using wildlife, using the weather, and using the sea. Because of these skill, sailors increased the ability(6)__ to navigate new seas when they used instruments, (7)______ including (include) longitude and latitude.

Language study
1. We may well wonder how seamen explored the oceans before latitude and longitude made it possible to plot a ship’s position on a map.
may/might well 很可能,极有可能

These are excellent photographs and we may well use them in our magazine.
这些是很不错的照片,我们很有可能把它们 用在我们的杂志上。

You might well find that you’ll need more by the weekend.
到周末你很可能会发现你需要更多东西。

2. minimum (min) adj. 最小的, 最低的 n. 最小值, 最小化。 其反义词为maximum (max) adj. 最高的, 最多的, 最大极限的 n. 最大量, 最大限度, 极大

The minimum requirements for the job are a degree and two years’ experience. 该工作的最低要求是要有学位和两年 的工作经验。

You must get a minimum of 40 questions right to pass the examination.
你最少必须答对40道题才能通过考试。

3. There was no secure method of measuring longitude until the 17th century when the British solved this theoretical problem. secure adj.安全的, 可靠的, 放心的, 无虑的 v. 保护, 使安全 Our house is secure from flood. But Some measures are needed to secure the school from a flood.

security n.安全,保安,保护 Security was tight during the President’s visit. For security reasons the visitors were searched.

4.The compass has a special magnetic

pointer which always indicates the North
Pole, so it is used to help find the direction

that the ship needs to go.

magnetic adj. 磁的, 有磁性的, 有吸引力的
magnet n. 磁体, 磁铁

5. Then he could tell if he was sailing on his correct rather than a random course. random n. 随意, 任意 adj. 任意的, 随便的, 胡乱的 make a random choice 任意选择 at random = aimlessly; without any plan 随机,随便 This evening , the school leaders will

check students’ apparel at random.

6. It was awkward to use as one of the points of reference was the moving ship itself. awkward adj. 难使用的, 笨拙的, 尴尬的; 棘手的, 难处理的 There was an awkward silence, when no one knew what to say. An awkward situation arose during the peace talks.

Homework
1.Review new words. 2.Finish the Exx. of unit4 on the paper.


相关文章:
Book9unit1reading
9-1-1 (总第 96 号) 编制人 审核人 目标及要求 学习 目标 Book9 Unit1.... 2.To improve the ability of detailed reading and to comprehend the text...
book8unit2reading
book8unit2reading_英语_高中教育_教育专区。Twins identical in sex and appearance 性别和相貌相同的双胞胎 Raise a storm of objections 引起了一阵强烈的反对 Ha...
Book9unit2词汇练案
导学案? 班级: 学号: 姓名: Book 9 Unit2 Sailing the oceans 使用时间:...4. Reading his works has really helped to broaden our ___, which makes...
高一英语 必修一Unit2 reading中英对照
高一英语 必修一Unit2 reading中英对照_英语_高中教育_教育专区 暂无评价|0人阅读|0次下载|举报文档高一英语 必修一Unit2 reading中英对照_英语_高中教育_教育专区...
Book9 Unit2 单项填空
1/2 相关文档推荐 Book9 Unit2 23页 免费 book9 unit2 reading 28页 2...1页 2财富值如要投诉违规内容,请到百度文库投诉中心;如要提出功能问题或意见建议...
2015-2016学年牛津译林版九年级下Unit2 Reading 2导学案
2015-2016学年牛津译林版九年级下Unit2 Reading 2导学案_初三英语_英语_初中教育_教育专区。电子备课格式(最新)课题 Unit 2 Reading II 主备课型 马海侠 主核...
高一英语必修二unit2Reading
高一英语必修二unit2Reading_英语_高中教育_教育专区。高一必修二 Unit2 Reading...2). I haven't been to Shanghai before and neither has my sister. 9. ...
9B Unit2 Period2(Reading)
9B Unit2 Period2(Reading)_英语_初中教育_教育专区 暂无评价|0人阅读|0次下载 9B Unit2 Period2(Reading)_英语_初中教育_教育专区。9B Unit 2 Robots Period...
2015年仁爱英语九年级上册Unit1-Unit2课文翻译
2015年仁爱英语九年级上册Unit1-Unit2课文翻译_初三...Section B (Kangkang is reading a report on ...9 I think it is important for these people to...
unit2 reading and writing
unit2 reading and writing_英语_高中教育_教育专区。汨罗市职业中专学校教学方案...cell Activity 9 read and banking service: telephone 学生列出的项 目不够全面...
更多相关标签:
book7 unit2 reading | book7unit5 reading | book4 unit1 reading | 选修七unit2 reading | 选修7unit2reading | 8b unit2 reading | 必修三 unit2 reading | 必修2 unit5 reading |