UnitUnit 1313

What is it?What is it?What color is it?What color is it?Why is it blue?Why is it blue?

Oxygen Oxygen AtomAtom

Hydrogen Hydrogen AtomAtom

What is water made up of?What is water made up of?

What properties of What properties of

water do you know?water do you know?

propertiesproperties

colorlesscolorless

tastelesstasteless

odorless odorless 无嗅的无嗅的

liquidliquid

absorbingabsorbingheatheat

dissolvingdissolving

solidsolidgasgas

液体液体固体 固体

溶解溶解

气压 气压 淡水淡水

无嗅的无嗅的说明说明依附依附物质物质

liquidliquid

solidsolid

dissolvedissolve

air pressureair pressure

fresh waterfresh water

odorlessodorless

illustrateillustrate

cling tocling to

substance /objectsubstance /object

A Quiz about A Quiz about

WaterWater!!

1. What state is water in at room1. What state is water in at room temperature?temperature? A. Liquid B. Solid C. GasA. Liquid B. Solid C. Gas2. The chemical structure of water2. The chemical structure of water is _____is _____ A. two hydrogen atoms and oneA. two hydrogen atoms and one oxygen atomoxygen atom B. two oxygen atoms and oneB. two oxygen atoms and one hydrogen atomhydrogen atom

3. If you pour water and 3. If you pour water and

vegetable oil into one glass, vegetable oil into one glass,

what happens?what happens?

A. Oil floats on the water.A. Oil floats on the water.

B. Water floats on the oil.B. Water floats on the oil.

C. They mix together.C. They mix together.

4. Will chalk be dissolved if you put it 4. Will chalk be dissolved if you put it

into water?into water?

A. Yes B. NoA. Yes B. No

5. What’s the sea water?5. What’s the sea water?

A. It’s a mixture of dissolved gasesA. It’s a mixture of dissolved gases

and solids with fresh water.and solids with fresh water.

B. Sea water is lighter than pureB. Sea water is lighter than pure

water. water.

6. Does the sea freeze?6. Does the sea freeze?

A. Yes A. Yes B. NoB. No

7. Which is heavier, sea water or7. Which is heavier, sea water or

pure water?pure water?

A. Sea water A. Sea water B. Pure waterB. Pure water

8. Put an ice cube in a glass of pure8. Put an ice cube in a glass of pure

water, what happens?water, what happens?

A. It floats in the water.A. It floats in the water.

B. It sinks.B. It sinks.

9. Put an ice cube in a glass of salt 9. Put an ice cube in a glass of salt

water, what happens?water, what happens?

A. It floats on the water.A. It floats on the water.

B. It sinks.B. It sinks.

ExperimentsExperiments

22

33

11

Look at the experiments and Look at the experiments and explain what happens and explain what happens and

why.why.1. The piece of paper 1. The piece of paper will cling to the cup.will cling to the cup.

Because of the Because of the air pressure.air pressure.

2. The oil will float a2. The oil will float above the water. bove the water.

Because of the diBecause of the different density offerent density of the two. f the two.

3. The chalk will be 3. The chalk will be dissolved. dissolved.

Because the water mBecause the water molecule is polar, it can olecule is polar, it can break down both solibreak down both solids and gases.ds and gases.

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4. The ice cube put in the glass with salt 4. The ice cube put in the glass with salt water will float higher in the water water will float higher in the water than the one in fresh water than the one in fresh water

Because of the different density of Because of the different density of the water.the water.

11

Experiment 1Experiment 1 shows how shows how air pressureair pressure causes a piece causes a piece

of thick paper to of thick paper to cling tocling to 依附依附an upturned glass of water.an upturned glass of water.

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Experiment 2Experiment 2 illustrates how illustrates how substances with different substances with different densitydensity

密度 密度 behave when placed behave when placed in the same container.in the same container.

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Experiment 3Experiment 3 is an example is an example

of how water of how water dissolvesdissolves

substances and objects.substances and objects.

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Experiment 4Experiment 4 illustrates some illustrates some

of the differences betweenof the differences between

salt salt water and water and fresh fresh water.water.

Do you know how muchDo you know how much

water there is on the earth?water there is on the earth?

世界淡水资源极其有限。我们休养世界淡水资源极其有限。我们休养生息的地球虽然有生息的地球虽然有 70.8%70.8% 的面积为水所的面积为水所覆盖，但其中覆盖，但其中 97.5%97.5% 的水是咸水，无法的水是咸水，无法饮用。在余下的饮用。在余下的 2.5%2.5% 的淡水中，有的淡水中，有 8787%% 是人类难以利用的两极冰盖、高山冰是人类难以利用的两极冰盖、高山冰川和永冻地带的冰雪。人类真正能够利川和永冻地带的冰雪。人类真正能够利用的是江河湖泊以及地下水中一部分，用的是江河湖泊以及地下水中一部分，约占地球总水量的约占地球总水量的 0.26%0.26% 。有人比喻说，。有人比喻说，在地球这个大水缸里可以用的水只有一在地球这个大水缸里可以用的水只有一汤匙。 汤匙。

我国水资源现状令人担忧我国水资源现状令人担忧我国是一个干旱缺水严重的国家——我国是一个干旱缺水严重的国家——淡水资源总量：淡水资源总量： 2800028000 亿立方米亿立方米（占全球水资源的（占全球水资源的 8%8% ，属世界第，属世界第四四位）位）人均水资源量：人均水资源量： 23002300 立方米立方米（为世界平均水平的（为世界平均水平的 1/41/4 ，居世界第，居世界第 121121

位）位）2020 世纪末，全国世纪末，全国 600600 多座城市中——多座城市中——供水不足的城市：供水不足的城市： 400400 多个多个（其中比较严重缺水的：（其中比较严重缺水的： 110110 个）个）

2222ndnd, March, March

                                         

          20052005 : Water for Life : Water for Life

                                         

                          

20042004 : Water and Disasters : Water and Disasters

                         2003 2003 : Water for Future: Water for Future

                         20022002 : Water for Development : Water for Development

                         20012001 : Water for Health : Water for Health

                       20002000 : Water for the Twenty-first Century : Water for the Twenty-first Century

World Water Day World Water Day for 2006: for 2006:

We plan our cities near water; we bathe in We plan our cities near water; we bathe in

water; we play in water; we work with water. water; we play in water; we work with water.

Our economies are built on the strength of Our economies are built on the strength of

water transportation - and the products we buy water transportation - and the products we buy

and sell are all partly water, in one way or and sell are all partly water, in one way or

another. Our daily lives are built on water, and another. Our daily lives are built on water, and

shaped by it. Without the water that surrounds shaped by it. Without the water that surrounds

us - the humidity of the air, the roughness of us - the humidity of the air, the roughness of

the river's current, the flow from the kitchen the river's current, the flow from the kitchen

tap - our lives would be impossible. tap - our lives would be impossible.

The theme ‘Water and Culture’‘Water and Culture’ of WWD 2006 draws attention to the fact that there are as many ways of viewing, using, and celebrating water as there are cultural traditions across the world. Sacred, water is at the heart of many religions and is used in different rites and ceremonies. Fascinating and ephemeral, water has been represented in art for centuries - in music, painting, writing, cinema - and it is an essential factor in many scientific endeavours as well. Each region of the world has a different way of holding water sacred, but each recognizes its value, and its central place in human lives. Cultural traditions, indigenous practices, and societal values determine how people perceive and manage water in the world's different regions.

Where there is Where there is water, there is life!water, there is life!

Water Water is a must to life.is a must to life. Without water, Without water,

life would not exist.life would not exist.

In what ways is

In what ways is

water being used?

water being used?

Speaking

Speaking

Speaking

Speaking

Look at the following sixLook at the following six

pictures. Choose one of pictures. Choose one of

them to tell the importancethem to tell the importance

of using and protecting ourof using and protecting our

water in your own words. water in your own words.

Water is Water is being used for …being used for …

Water is Water is being used for …being used for …

ElectriciElectricityty AgricultuAgricultu

re re Home useHome use

IndustryIndustry

Transport Transport

EntertainmeEntertainmentnt

Three Gorges ProjectThree Gorges Project

Three Gorges ProjThree Gorges Projectect is the largest w is the largest water conservancy ater conservancy (( 保护保护 ) project ev) project ever built in the worer built in the world. It is said that tld. It is said that the whole project he whole project will be completed will be completed in the year 2009 as in the year 2009 as planned.planned.

If the project is completed in the year 2009,If the project is completed in the year 2009,

What advantages will it bring to us?What advantages will it bring to us?

What problems may it cause? What problems may it cause?

How can we deal with these problems? How can we deal with these problems?

What should we do to solve theseWhat should we do to solve these

problems?problems?

Do you know how Do you know how

electricity is produced?electricity is produced?

Do you know how Do you know how

electricity is produced?electricity is produced? The water is being used to generate eThe water is being used to generate e

lectricity.lectricity. Building up behind a high dam, water acBuilding up behind a high dam, water ac

cumulates (cumulates ( 累积累积 ) potential energy () potential energy ( 势能势能 ). ). This is transformed into mechanical This is transformed into mechanical

energy when the water rushes down. energy when the water rushes down.

How to save water in our homes?How to save water in our homes?

Reduce faucets flow. Avoid letting the water Reduce faucets flow. Avoid letting the water run when brushing teeth, washing dishes, run when brushing teeth, washing dishes, and shaving etc.and shaving etc.

Reduce showers flow. Install a water-efficient Reduce showers flow. Install a water-efficient shower head and spend less time in the shower head and spend less time in the shower. shower.

Replace aging toilets and clothes washers Replace aging toilets and clothes washers with high efficiency models. Take advantagewith high efficiency models. Take advantage of City rebates offered for low-flow and of City rebates offered for low-flow and Wash Wise models. Wash Wise models.

Repair leaks. Fix faucet and toilet leaks.Repair leaks. Fix faucet and toilet leaks.

No matter who we are, where we No matter who we are, where we are, or what we do, we are all are, or what we do, we are all dependent on water. It is the source dependent on water. It is the source of all life and we need it every day. of all life and we need it every day. But with the world's growing But with the world's growing population and fast developing population and fast developing economies, the earth's water reserves economies, the earth's water reserves are drying up fast.are drying up fast.

Read the following Read the following passage.passage.

Listening

Listening

Listening

Listening

Samuel TaylorSamuel Taylor

ColeridgeColeridge

(1772-1834) (1772-1834)

gooney birdgooney bird

die downdie down

live throughlive through

the rest ofthe rest of

farewellfarewell

sufferingssufferings

信天翁变弱 度过

剩下的再见苦难

1. Who tells the story in the poem?

2. What does one of the sailors do?

3. What do you think will happen next?

4. Why are the others sailors frightened?

The story is told by a The story is told by a mysterious guest at a mysterious guest at a wedding.wedding.He shoots a bird that flies He shoots a bird that flies above the ship.above the ship. Various answers are Various answers are possible.possible. Because the bird is Because the bird is thought to bring good thought to bring good luck to the ship .luck to the ship .

1. What happens to the sailors?

2. What happens to the mariner ? Why?

3. Why is the person telling the story?

4. Who is the person that tells the story in the poem?

All the mariners die ---All the mariners die ---except for the one except for the one who shot the bird.who shot the bird.Two gods decide that the Two gods decide that the mariner will live but must mariner will live but must always tell his story.always tell his story.He has to tell his story to He has to tell his story to everyone he meets.everyone he meets.

The ancient The ancient mariner.mariner.

Part1. Many great poets have written about the beauty and dangers of the seas and oceans. In the 18th century, the English poet Samuel Taylor Coleridge wrote a poem called “The Rime of the Ancient Mariner”. In the poem, a mysterious guest tells a strange story to the people at a wedding. He begins his story by describing how a ship sets out to sea. One day, one of the sailors, or mariners, shoots a bird that flies above the ship. When the other mariners see what he has done, they are frightened and angry. The bird he has killed is

a bird that brings good luck to the ship. By

killing the bird, the mariner has brought bad

luck and death to the sailors. Soon, things turn

bad. The wind dies down and the sailors are

hungry and thirsty. There is water all around

them. But they can’t drink it because it is too

salty. “Water, water everywhere, nor any drop to

drink.” The mariners are so thirsty, hungry, and

frightened that they begin to imagine things: they

think they see monsters walking on the water.

Part2 In the poem, two gods argue over what should happen to the ship and the mariners. Finally they decide that all must die – except the mariner who shot the bird. He must live though it all and will pay by having to tell the story to all the people he meets the rest of his life. On the ship, the frightened mariner watches as the other sailors fall done dead on the ship’s deck Left alone on the ship, drifting on the ocean, the mariner suffers from loneliness and fear.

Alone alone, all , all alone,Alone alone, all , all alone,

Alone on a wide, wide sea!Alone on a wide, wide sea!

When the mariner is rescued at last, he mus

t walk around and tell his story. This is what the

guest tells the people at the wedding. His story t

old, the ancient mariner says farewell and asks t

hem to learn from his sufferings.

1.This poem was written by a British poet Samuel Taylor Coleridge.

2. In the poem, one of the sailors kills a fish under the ship.

3. It is believed that the animal he kills is one that brings good luck to the ship.

4. Other sailors are so frightened and angry that they kill the sailor.

5. The sailors are extremely thirsty but they can’t drink the water in the sea,

because it is too dirty.

birdbirdaboveabove

saltysalty