Unit 3 The Earth Period 3 Listening 课件.ppt

1、Unit 3,Module 2 The natural world,Oxford English,Listening,Period 3,The Earth,land,ocean,1,Can you name them?,Asia,Europe,North America,South America,Africa,Antarctica,Oceania,The continents of the world,Can you name them?,the Atlantic Ocean,the Indian Ocean,The Arctic Ocean,The Pacific Ocean,the oc

2、eans of the world,1. There are _ continents in the world. They are _ _. 2. There are _ oceans in the world. They are _ _ _.,seven,four,I remember!,Do you know?,1.In 2000, the worlds population is _. By 2025, the world will have _ people. 2. About _of the world is land. 3.Oceans cover about _ of the

3、earths surface. 4.Deserts cover _ of the earths surface. 5.The worlds biggest island is _. The coldest and the driest continent in the world is _. 6.The longest river in the world is _.,six billion,7.8 billion,one-fourth,three-quarters,twenty percent,Greenland,Antarctic,The Nile River,Listening exer

4、cise,2,Sea facts,When you listen for facts, you need to catch the important words. Names, times and numbers are usually important. They can help you find the correct answers to the questions.,Pre-listening,1 a b,3 a b,2 a b,one quarter three quarters,whaletiger,5 kilometres 10 kilometres,1 kilometre

5、 = 1,000 metres,Listen to a quiz about the sea. Then circle the correct pictures.,1 a b,3 a b,2 a b,one quarter three quarters,whale tiger,5 kilometres 10 kilometres,While-listening,Three quarters of the Earth is covered by water.,Post-listening,Describe the pictures according to the key words.,thre

6、e quarters the Earth water,whale live sea,the deepest part sea more than 10 kilometres,The whale lives in the sea.,The deepest part of the sea is more than 10 kilometres deep.,1 Only _ of the Earth is land. a 3/4 b 1/4 2 Most of the water on Earth is in _. a streams and rivers b the seas 3 Whales _

7、fish. a are b are not 4 Sharks are _. a small b dangerous 5 _ catch fish for people to eat. a Fishermen b Farmers 6 Sea water usually tastes _. a sweet b salty 7 People _ drink sea water. a can b cannot,Quiz time,Try the quiz about the sea.,一、 用“基数词序数词”表示： 二、用percent等表示 三、用part表示 四、用“基数词介词基数词”表示,3,分

8、数在英语中通常是借助于表达的。其中基数词表示分子，序数词表示分母。,分数由分子及分母两部分构成。用英语表达时，分子用基数词，分母用序数词。 若分子为1，则分母的序数词为单数形式，若分子大于1，则分母的序数词用复数形式。,一、 用“基数词序数词”表示,分子基，分母序。分子1，分母加s。,举例如下 二分之一a/onehalf 三分之一one - third 四分之一one quarter 四分之三three- fourthsthree quarters 五分之二two- fifths 十分之九nine- tenths,注意：,二分之一不能说 a(one) second，而要说 a(one) hal

9、f。 四分之一和四分之三可以说 a(one) fourth 和 three-fourths，但常用 aquarter和 three quarters,二、用percent等表示,表示百分之一可以说one（a）hundredth，但更常用one percent或per cent，即用百分数表示法来表达。 例如： Seventy-five percent of the earthssur- face is covered by water 地球表面的75被水覆盖着。,三、用part表示,名词part有“分之一”的意思，分子大于1时，part用复数。 表示分数的结构一般有以下三种： （1）“基数词（或a）序数词part（s）” a hundred part百分之一（2）“基数词part（s）in基数词” five parts in a thousand千分之五（3）“基数词part（s）per基数词” one part per million百万分之一,四、用“基数词介词基数词”表示,借助介词表示分数，介词前的数词是分子，介词后的数词是分母。 例如： Ninety-nine peopl e