课件13张PPT。选修9 Unit2 Sailing the oceans第一部分:Questions
1.When did early sailors have a practical method of measuring longitude?
2.Which is more precise and simplified, the astrolabe or the quadrant?
3.How did early seamen use weather during the navigation?
4.What does seaweed look like when it is near land?
5.Where are we now when the North Star is along the horizon?In the 17th centuryThe quadrant.It looks fresh and has strong smell.They used fog and winds.The equator.第二部分:Language points
1.The voyages of travelers before the 17th century show that they were not at the mercy of the sea even though they did not have the modern navigational aids.
(1)at the mercy of
without any protection against; helpless before 任由…摆布;在…面前无助
They were lost at sea,
__________________________________.(他们在海上迷失了方向,任凭风和天气的摆布)at the mercy of wind and weatherI don’t like to be___________________________.(我不愿受这样一个人的摆布)
扩展:have (no) mercy on/show mercy to
对…(不)同情
without mercy毫不留情地
2.This seems to have been the first and most useful form of exploration, which carried the minimum amount of risk.
carry 在此意思为“具备;含有;包含”
This report_______________________________
这份报告含有对未来困境的严重警告)
minimum n./adj. 最小(的),最少(的),最低(的)at the mercy of such a mancarried a serious warning of future troubleWhat’s____________________(最低年龄)for leaving school in Britain?
You’ll need____________________________.
(你需要最底20000美元的押金)
--------------------------------------------------(我至少需要7个小时的睡眠)
--------------------------------------------------------- (他每年至少得到25000英镑)
minimum的反义词是maxim
The bus can carry------------------------------------------(至少40人).
the minimum agea minimum of deposit of $20,000I need a minimum of 7 hours’ sleep.The minimum he will accept is &25.000 a yeara minimum of 40 people__________________________________
(25000美元是我们付得起的最高价)
词语联想:the least最少(+不可数名词) the fewest最少(+可数名词)
the lowest最低
3.If it was fresh and smelled strongly,then the ship was close to land
close adj.
(1) near in space or time空间上或时间上靠近的
(2) likely 可能的
(3) careful 小心的
close to death ( )$25,000 is the maximum we can afford离死亡不远take a close look at sth ( )
keep a close watch/eye on ( )
They chose a spot_____________________.
(他们选择了一个离河不远的地方进行野餐。)
Your birthday________________________.(你的生日离我的生日不远)
The two countries____________________ (即将签署)a peace agreement.
4.Seamen used it to help identify the position of a stream or river when they were close to land.仔细看,走近看严密地关注close to the river for their picnicis close to mineare close to signingidentify vt.
把…等同于;认出;鉴定;认为同一
n. identification辨认;鉴定;证明;视为同一
identity n.同一性;身份;一致;特性;恒等式
identity card( )
5.An early method of measuring speed involved throwing a knotted rope tied to a log over the side of the ship.
involve vt. 包括;使陷于;使参与;影响
Don’t_______other people___your mistakes.(别把别人牵涉到你的错误中去。)
All the children__________________in the school play.(所有的孩子都参加了学校排练的戏剧。)身份证involveinare involvedThe matter is serious because
_____________________________________
(这件事很严重,因为它影响到你的声誉。)
比较:involve: (必然)包括(的结果)
include:包括(属于整体的部分)
contain:含有(几种成分)
hold: (含有多少容量)
(1)Taking this job____________living abroad.
(2)The price______________d rfeewepostage charges.
(3)Beer_____________________alcohol.
(4)How much water does the pan_______?it involves your reputationinvolvesincluded(s)containshold6.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;
at random=aimless; without any plan 随机;随便
Passengers at the airport
___________________________.
(搜查人员对)机场上的旅客随便挑几个加以搜查。
Dirty dishes were piled ______________.(乱七八糟)were searched at randomat random7.However, 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
an awkward remark 令人尴尬的评论
There was____________________when no one knew what to say.(当谁都不知道说什么时,出现了令人尴尬的沉默)
He is awkward; he keeps dropping things.
(他_______,总是丢东西)
__________________________arose during the peace talk.(在和平谈判中出现了棘手的情况)an awkward silence很笨An awkward situationreference n. 提及;涉及;参考;参考书目;证明书(人);介绍信(人)
refer vt.提到;涉及;查阅;咨询;指点
At the meeting the teacher made______________
(提及)his heroic deeds.
These are_____________________(参考书)for teachers.
The teacher often_______his pupils_____this dictionary.(老师经常指点他的学生查这本词典)
8.The textant was the updated version of the astrolabe and quadrant which reduced the tendency to make mistakes.
update vt.使现代化;修正;校正;更新 n. 现代化;更新references toreference booksrefersto—————————adj.最新的;现代化的;适时的
an________and revised edition 最新修订本
tendency n.趋向;倾向 tend to do sth.
Tom is nice but he___________________talk too much.(汤姆人不错,就是往往太唠叨)
We have noticed________________________for people to work at home instead of in offices.(我们注意到一种趋势,越来越多的人们在家里工作而不在办公室里上班)updatedupdatedhas a tendency toa growing tendency