Welcome to our class
Look at the pictures and answer the questions
nuclear energy
1. What source of energy does each picture refer to?
wind energy
water energy
solar energy
2.What do you need energy for ?
Unit 11:

SOURCES OF ENERGY
A. READING
At present , most of our energy comes from fossil fuels (oil , coal , and natural gas). However , such reserves are limited . Because power demand is increasing very rapidly , fossil fuels will be exhausted within a relatively short time . Therefore , people must develop and use alternative sources of energy.
One alternative source is nuclear energy . Nuclear energy can provide enough electricity for the world`s needs for hundreds of years , but it can be very dangerous . Another alternative source of energy is geothermal heat , which comes from deep inside the earth . Scientists use this heat to make energy . However , this energy is available only in a few places in the world.
The sun , water , and the wind are other alternative sources of energy . The wind turns windmills and moves sailboats . It is a clean source of energy , and there is lots of it . Unfortunately , If the wind does not blow , there is no wind energy . When water moves from a high place to the lower place , it makes energy . And as dams cost a lot of money , so water energy is expensive.
The sun releases large amounts of energy every day . This energy can be changed into electricity . Many countries use solar energy for their daily life . Solar panels on the roofs of houses can create enough energy to heat or cool an entire house . Solar energy is not only plentiful and infinite but also clean and safe.
Although there are some disadvantages , the potential of alternative sources of energy is great . However , how to make full use of these sources of energy is a question for researchers all over the world.
Listen to the passage and then find the new words and phrases
I. Vocabulary
- alternative / ɔ:l`tə:nətiv / (a) : cã thÓ thay thÕ
- release / ri`li:s / (v) : phãng ra, th¶ ra
- limited / `limitid / (a) : cã giíi h¹n
- Make full use of (vph) : tËn dông triÖt ®Ó
- exhausted / ig`zɔ:stid / (a) : c¹n kiÖt
- fossil fuel / `fɔsl fjuəl / (nph): nhiªn liÖu ho¸ th¹ch
- geothermal heat /,dʒi:ou`θə:məl hi:t /(nph):®Þa nhiÖt
- nuclear energy /`nju:kliə / (nph):n¨ng l­îng h¹t nh©n
- solar energy / `soulə/ (nph) : n¨ng l­îng mÆt trêi
- energy / `enədʒi / (n) : n¨ng l­îng
At present , most of our energy comes from fossil fuels (oil , coal , and natural gas). However , such reserves are limited . Because power demand is increasing very rapidly , fossil fuels will be exhausted within a relatively short time . Therefore , people must develop and use alternative sources of energy.
One alternative source is nuclear energy . Nuclear energy can provide enough electricity for the world`s needs for hundreds of years , but it can be very dangerous . Another alternative source of energy is geothermal heat , which comes from deep inside the earth . Scientists use this heat to make energy . However , this energy is available only in a few places in the world.
The sun , water , and the wind are other alternative sources of energy . The wind turns windmills and moves sailboats . It is a clean source of energy , and there is lots of it . Unfortunately , If the wind does not blow , there is no wind energy . When water moves from a high place to the lower place , it makes energy . And as dams cost a lot of money , so water energy is expensive.
The sun releases large amounts of energy every day . This energy can be changed into electricity . Many countries use solar energy for their daily life . Solar panels on the roofs of houses can create enough energy to heat or cool an entire house . Solar energy is not only plentiful and infinite but also clean and safe.
Although there are some disadvantages , the potential of alternative sources of energy is great . However , how to make full use of these sources of energy is a question for researchers all over the world.
Read the passage and then do the tasks that follow
II. Practice
Task 1: The words in the box all appear in the passage.
Fill each blank with a suitable word.(Use a dictionary when necessary)
alternative
limited
energy
released
exhausted
1 . Six hundred balloons were ______________ at the ceremony .
2 . They are looking for _______________ methods of making it .
3 . People use ________________ to run machines , heat and cool their homes .
4 . The food in the restaurant is cheap , but the choice
is rather_________________ .
5 . Fuel supplies are nearly_________________ .
Unlimited
Very dangerous.
Plentiful , infinite, clean and safe.
Produced only in daytime
Clean and safe
Must build dams , so expensive
Clean and unlimited
No energy when no wind
Geothermal heat
Available only in a few places.
Clean, safe
Task 2: Scan the passage and find each source of energy having their advantage(s) and disadvantage(s)
Geothermal
heat
Nuclear power
Wind power
Water power
Solar energy
2
1
4
3
5
Task 3: Answer the question.
1.What does most of our energy come from?
2.How many alternative sources of energy are mentioned in the text?
Most of our energy comes from fossil fuels.
5 sources of energy : nuclear, solar, water, wind energy and geothermal heat .
Complete the summary of the reading passage by filling each blank with a suitable word from the box
We need energy to live and work. Our nature source of (1) ______ is oil . Oil is (2) ____ kind of fossil fuel. The amount of fossil (3) _____ in the world is(4) _____ . Therefore, we must save it, and at the same time, we must fine new source of energy. Geothermal heat and nuclear power are (5) __________ source of energy. They can give us electricity. Other alternative (6) _______ are the sun, waves and water. These source are not only (7)________ and available but also clean and save for the (8) _________ . People should develop and use them more and more in the future.
one
environment
alternative
limited
unlimited
sources
energy
fuels
III. Free - practice
- Prepare speaking.
- Learn by heart the
new words

Homework:
Thank you for your attention