Unit 3 Science and Technology Lesson 1 Water period 2 课件（19张PPT）

课件19张PPT。Water
Period 2RiddleIt has no colour. It can flow.
Fire is afraid of it.
We drink it every day.
We call it liquid gold.
It’s one of the most important natural resources in the world.waterWhat do you know about water?
Does it have any colour?
Does it have any shape?
Does it have any taste?
Scan and find the main idea_______
_______
________
a. Water is limited and precious.
b. Water is important.
c. Water should be saved and protected. b. a. c.Listen to the first paragraph and tell the following statements are true of false:
1.Water is one of the most important natural
resources in the world. ( )
2.It is used in drinking, recreation, farming
and industry. ( )
3.Many everyday tasks can be performed
without water. ( )TTFFew Why is water important?
Answer:
Water is important because______________.
Answer (paragraph 1)Learn and practice (paragraph 1)Water is used for…=Water is used to…Water is used in…farmingindustrydrinkrecreationraise goldfishdaily lifebe used in…(领域或方面）be used for/ to…（表示用途） A: Why is water important?
B: Water is important because ________.
Key words:
natural resources;
drinking, recreation;
farming, industry;
few tasks, can be performed
Do pair work (paragraph 1)However, water resources are____________. Although ___________ of the Earth’s
surface is covered with water, __ per cent of it is salt water in the sea. Only __ per cent of the world’s water is fresh water. But not all of the world’s fresh water can be used in our daily lives because __ per cent of it is ice and __ per cent is underground. Only __ percent of fresh water is available in lakes and rivers. Fresh water is so ________ that it is sometimes called liquid gold. three-fourths97370255Fill in (paragraph 2)limitedprecious
75%
97% 3%
70% 25%
5%
What does the six numbers stand for（代表） ?Three-fourths of the Earth's surface
is covered with water.underground waterfresh waterice salt wateravailable water in lakes and rivers 3/4* 3% *5% = 0.001125 limited a.有限的
precious a.宝贵的1.Why is more water needed?
More water is needed because of _____
__________ ______.
2.What must we do?
We must ____ and _______ water resources.
3.What are the tips for saving water according
to the text?
When you brush your teeth and wash your
face, don’t let ___ ___ ___.
b.take a _______ shower.
c. ___ any leaky tap.
d. Do not _____rubbish or_____ dirty water
into rivers and lakes.rapidpopulationgrowthsaveprotectthetaprunshorterFixthrowpour We should ____________________.
Here are some tips for saving and protecting water.
First,_______________________
Second,______________________
Third,________________________
Finally,_______________________
Remember, the less water we waste
or pollute, the more we will have for tomorrow.Retell (paragraph3) the less water we waste
or pollute, the more we will have for tomorrow.the less water we wasteor pollute, the more we will have fortomorrow.Remember,Learn and PractiseSentences pattern:
the +比较级+句子， the+比较级+句子 “越…,越…1.The ________（little) we waste or pollute, the ________(much) we will have for tomorrow.
2. The _______（soon), the _______(good).
3. The ________ (few) mistakes you make, the __________ (great) progress you will make.soonerbetterlessmorefewergreater
one of the most important natural resources; drinking, recreation, farming, industry; few tasks performedParagraph 1:Water is importantParagraph 2:Water is limited/precious.3/4 water; 97% salt water; 3% fresh water;
70% ice; 25 % underground; 5 % available in rivers and lakes; precious, liquid goldParagraph 3:We should save and protect water resources.
rapid population growth, more water; save and protect it; some tips
SummarizeWe never know the worth of water till the well is dry.
井干方知水可贵。
Enjoy ProverbsThe water that bears the boat is the same that swallows it up.水能载舟，亦能覆舟。
Still waters run deep.静水深流。/大智若愚。
We never know the worth of water till the well is dry. 井干方知水可贵。
Blood is thicker than water.血浓于水。`q1Assignment
1.Read and retell the text fluently.
2.Write at least 70 words about the topic: How to save and protect water?
Use the following points as a guide . （短文须包含下列要点）
●Why is water important?
●Why is water limited?
●What can we do to save and protect water? (at least three tips)