Tieng anh 12

Welcome to teachers and students attending an English lesson.
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3
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4
* What do they do to the air?
An atomic bomb test
* What other things do you think make the air dirty?
to make dirty
Clean air provides us with a healthy supply of oxygen. When wastes are poured into the atmosphere, the air becomes contaminated and unpleasant to breathe. This is air pollution.
Ex:
We shouldn`t contaminate our river with wastes and chemicals.
to contaminate (sth with sth)
: pollution

Ex: water vapour = steam


CO2
to be found or be present
Ex: Sugar occurs naturally in fruit.
Water vapour and carbon dioxide occur in the air naturally.

vapor (A.E.)
- dust storm (n)
Examples of air pollution are dust storms, volcanic eruptions, forest fires caused by lightning, pollen, and marsh gases.

- volcano (n)
an active volcano
volcanic (a)
a volcanic eruption
+ a dormant volcano
+ an extinct volcano
- pollen (n)
- marsh gas (n) :
(CH4)
methane
to throw out or away
? disposal (n)
A large amount of air pollution in cities comes from sources other than industry, mainly automobiles, home heating, and garbage disposal.

- to contaminate
? contamination [k ntỉmi`nei?n ]
e
- vapour [`veip ]
e
- carbon dioxide [`ka:b n dai` ksaid ]
e
c
- to occur [ `k :]
e
e
- volcano
volcanic
- pollen
- marsh
? disposal
- to dispose
[dis`pouz]
[v l`keinou ]
c
[v l`kænik ]
c
[`p lin
c
[` ma:∫ ]
[dis`pouz l ]
e
1. What does clean air provide us?
2. When does the air become contaminated and unpleasant breathe?
3. Give some examples of air pollution in nature.
4. What are some sources of air pollution in cities?
F
F
T
T
Read the text and answer True or False.
Pollution caused by chemicals from car exhaust fumes and smoke from factories is a very serious problem because it leads to the loss of the ozone layer. Car exhaust fumes contain carbon monoxide (CO) and lead (Pb) which are highly poisonous. All of us know that without the ozone layer, not only human beings but also all plants and animals life are exposed (ñaët vaøo) to dangerous rays (tia) from the sun. Even refrigeration and air-conditioning system which make our lives more convenient can also have dangerous emissions. They emit poisonous gases into the air that we breathe.
1. Car exhaust fumes contain carbon monoxide and lead.

2. Pollution caused by chemichals from only car exhaused fumes.

3. Without the ozone layer, everything is all right.

4. Refrigeration and air-conditioning system also lead to pollution.

* In your opinion, what can we do to reduce air pollution in cities?
- Use public transport as much as possible.
Whenever possible take your bicycle.
Use only unleaded petrol.
Don’t burn garbage, put them in dustbins so that they can be collected.
Keep your house and the surrounding clean.

H1
H2
H3
H4
 Learn the new words by heart.
 Prepare the next paragraphs “…and automobiles”.
Vocabulary:
- carbon monoxide
- outdourless (a)  ? (n)
- tail - pipe
- emission (n)  ? (v)
- partice (n)
- organic gas
Questions:
1. How do vehicles pollute the air in cities?
2. Where can smog be found?
HOMEWORK