Transcript PowerPoint 演示文稿

Without her ,can you survive ?
Treasure natural resources Save water
Water all around us.
Water has no taste at all.
Water has no smell.
Water’s in the waterfall,
The pump,
The tap,
The well.
Water’s everywhere around us.
Water’s in the rain,
In the bath and in the pond,,
And in the sea again.
What do we use water to do at home?
to make drinks
to clean our teeth
to wash hands
to wash dishes
to cook rice to wash clothes
What do we use water to do at work?
to put out fires
to make
electricity
to make things in factories
to water flowers
to water trees
How does water come to our homes?
pipes
our taps
a reservoir
a special factory
Where does rain come from?
2 The water makes clouds.
3 The wind blows the
clouds to the land.
4. It rains
1 Water comes from
the sea
A:How can we save water?
B:We can save water by fixing dripping taps.
(turn a dripping tap off, take a shower instead
of a bath)
A:How can we save water?
B:We can save water by not brushing our teeth
under a running tap.We can use a mug instead.
(wash the dishes, wash vegetables, waste water
for playing games
Listening :fill in the blanks
element it is very important
Water is a kind of natural ________,
to us. We cannot live without it. And water is also called
valuable
gold
“ the liquid ______”
because it is much more_________
than it.
There is much water on the earth, but we cannot use
salty .
most of it. About 97.4% of the earth’s water is _____
Most of the fresh water is snow and ice near the North and
South Poles.
percent of the water on the
We can use only about one ________
earth. We use water from both lakes and rivers and so on.
Water can help us do a lot of things. It is very useful, it is
servant Yet if we don’t use it well, it also
our good “________”.
dangerous .So we human beings must make
can be very __________
imagine what the world will be
good use of it. Can you ________
like without water?
The story in Chapter
6 you are going to
read about something
that is more valuable
than gold—water.
Without water, we can’t live. Do you know the questions about water?
1. How long could you live without water?( a )
a. A few days
b. A few weeks
c. A few hours
People can live without food for more than a month, but they can’t live
without water for more than a week. Losing more than 20% of the
normal water content of our bodies will result in a painful death.
2 How many liters of water does you
body need daily?(a )
a. Two
b. Four
c. Eight
About 65-70% of our bodies are water,
s
so it is important for us to drink a lot
o
of water. Each day, a normal person
wi
will drink about 2.4 liters of water or
ot
other drinks. In America , the average
person will use 260 liters of water a day and on
average, each person will drink 60,600 liters of
water in his/her life.
3. What’s the amount of water do you need when you
exercise ?( a)
a. Increases
b. Remains the same
c. Decreases
You need more water during and after exercise because you lose
water by sweating and you need to replace the water that is lost.
4.what does water become when you freeze it?(
a. Liquid
b. Solid
b)
c. Gas
Water freezes at 0℃.When it freezes, it
changes into ice.Water boils at 100 ℃ when it
changes its form into a gas, becoming steam.
5.How much of the earth is covered by water? ( c )
a. One third
b. A half
c. Two thirds
Water covers 70% of the earth’s surface ,but only about 3% is fresh water.
All the rest is salt water .Of this 3%,less than 1% is in the form of lakes
or rivers .The remaining 2% is frozen in glaciers（冰川 ）at the North
and South poles
6.What is the scientific symbol for water?( a )
a. H2O
b. HO2
c. H2O2
H stands for hydrogen（氢） and O stands for oxygen .The symbol
means that each water molecule （分子）consists of two atoms （原
子）of hydrogen and one atom of oxygen.
(3) It flows to the
sea.
(2) It runs into
stream and rivers.
(4) It rises from
the sea to the sky.
(1) Water falls
from the clouds as
rain.
(5) It falls as rain
again.
increase /In’krI:s/
v. 增加 -to become or
make greater in number, quantity or size
e.g. She increased her speed to overtake
the lorry
反义：reduce/decrease
decrease /dI’krI:s/ v. 降低、减少 to become smaller or fewer
e.g. Profits have decreased by 15%.
remain /rI’meIn/ v. 保持 -to continue
to be
e.g. They remained silent throughout
the trial（审讯）.
freeze
/ frI:z/ v. (froze、frozen) 愣住；结
冰 -to change or be changed from
liquid to solid by extreme cold
e.g. The lake was frozen over.
freezing adj. 冻结的；极冷的
frozen adj. 冰冻的
反义 melt
liquid /’lIkwId/ n. 液体 -a
substance that
flows freely such has a water or oil.
e.g. Water is a liquid.
solid /’sClId/ n.
固体 -a substance that is
neither liquid or gas
e.g. He can’t eat solid food because of his illness.
scientific
/,saIEn’tIfIc/ n. 科学的 -used in
or involved in science
e.g. We should look at the matter from the
scientific point of view .我们应该以科学的角度看待这
件事。
scientist n. 科学家
science n. 科学
scientifically adj.科学地
symbol
/’sImbEl/ n. 标志；象征 -emblem
e.g White is the symbol of purity.
symbolize v.作为…的符号，象征
symbolic adj. 符号的
symbolical adj. 象征的；用作符号的
Language items
1.rise from …to …
e.g. The sun rise from the east to
the west.
2. fall from …as ….
e.g. Water fall from the clouds as
rain.
as (作为) prep.
How do we save
water in our daily
life?
Assignment :
1.Write at least 80 words on
the topic “Water,the liquid
gold”
2.Preview the text on Page
75
3.Copy the new words and
some phrases