Unit2 Sailing the Oceans Warming up 课件（28张）
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| 名称 | Unit2 Sailing the Oceans Warming up 课件（28张） |  | |
| 格式 | zip | ||
| 文件大小 | 11.8MB | ||
| 资源类型 | 教案 | ||
| 版本资源 | 人教版（新课程标准） | ||
| 科目 | 英语 | ||
| 更新时间 | 2018-08-03 06:19:59 | ||
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文档简介
课件28张PPT。Sailing The OceansCompassAstrolabe(星盘)Sextant(六分仪)Sea/nautical chartBearing Circle(方位圆）Quadrant（象限仪）Early navigational instrumentsAlongitudelatitude to find/locate/plot their position Key sentence
So how did they navigate so well with those ancient instrumentsReading for organizationSo● Knotted RopeCompass The Bearing CircleThe AstrolabeThe Quadrant●The Sextant● ● ● ● 百科全书Reading for information T or F
The compass always indicates the North Pole. The seamen could find the direction that the ship needed to go with its help.
Using bearing circle, the seamen could tell if he was sailing on his correct rather than a random course.
The Bearing Circle proved to be the most accurate and reliable of these early instruments.
Astrolabe was a more precise and simplified version of Quadrant.
The astrolabe, quadrant and sextant are all connected.Reading for informationThe compass always indicates the North Pole. The seamen could find the direction that the ship needed to go with its help.Ta magnetic pointerReading for information2. Using bearing circle, the seamen could tell if he was sailing on his correct rather than a random course.Trather than Reading for information 3. The Bearing Circle proved to be the most accurate and reliable of these early instruments.The Sextantsomething or somebody that can be depended onFReading for information Astrolabe was a more precise and simplified version of Quadrant.Use a quarter circle rather than the full circle
of the astrolabe
accurate/correctFQuadrantAstrolabeReading for information The astrolabe, quadrant and sextant are all connected.
TThey are development of one another. What are the usage, advantage and disadvantage of astrolabe, quadrant and sextant?Reading for informationReading for understandingtell the position--
measure how
high stars above
the horizon
measure the
angle between
two fixed objectsmore precise and
simplified
easier to handle ;
more portable
reduce the tendency
to make mistakes;
most accurate and
reliableawkward to use as
one of the points of
reference was the
moving ship itself
still used the moving
ship as one of the
fixed points of reference
convenient B. inconvenient
C. easy D. comfortableHappy MagazinesParaphrase “at the mercy of” in “The voyages of travellers before the 17th century show that they were not at the mercy of the sea with the help of some early navigational instruments.”Reading for understanding
Rewrite sth in your own wordsunder the control of the sea.Why are speed and time important in working out the longitude of a ship? Suppose the latitude is fixed. If you can know the speed and time, you can know ____________________to help you work out the longitude.Reading for understandingchange in your positionA seaman would measure the sun’s shadow and compare it with the height of the sun at midday. Then he could find his latitude. How did he manage to do that?Reading for understandingH90。||+-当地纬度直射点纬度=-
The passage is developed by __________.Reading for understandingtime/ logicReading for using at the mercy of; navigational instruments; secure; knotted; longitude; latitude; magnetic; random; awkward; reference; precise; portable, shortcoming; updated; tendency; reliable
Complete the following small passage (fill in the blanks)
with these words; some of them are not needed Samuel the sailor was extremely good at plotting his course. One day he set out with his ______________, so he would not be _______________ the sea. An accident did happen and he was blown off-course unluckily. However, he found the ______ by using the compass, which has a _____ pointer indicating the North Pole. To make the calculations more ______ , he used Quadrant to find out his _________. Thanks to these tools, he managed to sail back to his correct rather than a ______ course and finally reached his destination(目的地).navigational instrumentsat the mercy oflongitudemagneticprecise/reliable/secure latituderandomReading for usingImagine you were an ancient sailor. During your last voyage, you were blown off-course but you managed to find the correct course and reach the destination(目的地)safely. Give us an oral presentation about your experience.
( how did you manage to do so? longitude; latitude
introduce the instruments you chose)
(you can take Samuel’s experience for example)Life is full of difficulties.
with our wisdom
with our courage
with our creativity
We can conquer anything!HomeworkI. Read the passage again
II. Write down your last voyage experience
and this time add more details as much as possible and send it to sherry@163.com if you like
What kind of writing technique (skills) are used to introduce these ancient instruments?
A. using examples B. making comparisons
C. using charts D. giving explanationsReading for understandingBefore modern instruments were invented, people hardly used any navigation.
So how did they navigate so well with those ancient instrumentsReading for organizationSo● Knotted RopeCompass The Bearing CircleThe AstrolabeThe Quadrant●The Sextant● ● ● ● 百科全书Reading for information T or F
The compass always indicates the North Pole. The seamen could find the direction that the ship needed to go with its help.
Using bearing circle, the seamen could tell if he was sailing on his correct rather than a random course.
The Bearing Circle proved to be the most accurate and reliable of these early instruments.
Astrolabe was a more precise and simplified version of Quadrant.
The astrolabe, quadrant and sextant are all connected.Reading for informationThe compass always indicates the North Pole. The seamen could find the direction that the ship needed to go with its help.Ta magnetic pointerReading for information2. Using bearing circle, the seamen could tell if he was sailing on his correct rather than a random course.Trather than Reading for information 3. The Bearing Circle proved to be the most accurate and reliable of these early instruments.The Sextantsomething or somebody that can be depended onFReading for information Astrolabe was a more precise and simplified version of Quadrant.Use a quarter circle rather than the full circle
of the astrolabe
accurate/correctFQuadrantAstrolabeReading for information The astrolabe, quadrant and sextant are all connected.
TThey are development of one another. What are the usage, advantage and disadvantage of astrolabe, quadrant and sextant?Reading for informationReading for understandingtell the position--
measure how
high stars above
the horizon
measure the
angle between
two fixed objectsmore precise and
simplified
easier to handle ;
more portable
reduce the tendency
to make mistakes;
most accurate and
reliableawkward to use as
one of the points of
reference was the
moving ship itself
still used the moving
ship as one of the
fixed points of reference
convenient B. inconvenient
C. easy D. comfortableHappy MagazinesParaphrase “at the mercy of” in “The voyages of travellers before the 17th century show that they were not at the mercy of the sea with the help of some early navigational instruments.”Reading for understanding
Rewrite sth in your own wordsunder the control of the sea.Why are speed and time important in working out the longitude of a ship? Suppose the latitude is fixed. If you can know the speed and time, you can know ____________________to help you work out the longitude.Reading for understandingchange in your positionA seaman would measure the sun’s shadow and compare it with the height of the sun at midday. Then he could find his latitude. How did he manage to do that?Reading for understandingH90。||+-当地纬度直射点纬度=-
The passage is developed by __________.Reading for understandingtime/ logicReading for using at the mercy of; navigational instruments; secure; knotted; longitude; latitude; magnetic; random; awkward; reference; precise; portable, shortcoming; updated; tendency; reliable
Complete the following small passage (fill in the blanks)
with these words; some of them are not needed Samuel the sailor was extremely good at plotting his course. One day he set out with his ______________, so he would not be _______________ the sea. An accident did happen and he was blown off-course unluckily. However, he found the ______ by using the compass, which has a _____ pointer indicating the North Pole. To make the calculations more ______ , he used Quadrant to find out his _________. Thanks to these tools, he managed to sail back to his correct rather than a ______ course and finally reached his destination(目的地).navigational instrumentsat the mercy oflongitudemagneticprecise/reliable/secure latituderandomReading for usingImagine you were an ancient sailor. During your last voyage, you were blown off-course but you managed to find the correct course and reach the destination(目的地)safely. Give us an oral presentation about your experience.
( how did you manage to do so? longitude; latitude
introduce the instruments you chose)
(you can take Samuel’s experience for example)Life is full of difficulties.
with our wisdom
with our courage
with our creativity
We can conquer anything!HomeworkI. Read the passage again
II. Write down your last voyage experience
and this time add more details as much as possible and send it to sherry@163.com if you like
What kind of writing technique (skills) are used to introduce these ancient instruments?
A. using examples B. making comparisons
C. using charts D. giving explanationsReading for understandingBefore modern instruments were invented, people hardly used any navigation.