A dangerous servant

8B Chapter 3

1.What do you think of electricity? Why?2.Electricity gives power for all kinds of electrical appliances. Can you name some of the

electrical appliances we use in our lives?

(When we plug an appliance into the wall socket, we are using electricity produced by a generator.)

electrical appliances

an air conditioner a blender

a CD player

a computer a cooker

a hair dryera lamp

a kettle

electrical appliances

a heatera fan an iron

a microwavean oven

a printer

electrical appliances

a recordera refrigerator

a TV set

a vacuum cleaner a video player a washing machine

a mobile phone

(a fridge)

a robot

Where does a robot’s energy come from?Its energy comes from electricity.

Where does our energy come from?

(Energy is the power that makes things work.)

Perhaps without electricity our lives will not be interesting. Now let us talk about electricity.

What is it?

Electricity is the power which is produced by rubbing

(friction), by a machine called a generator or by

chemical means (e.g. a battery).

Can we see it ?

No, it’s a kind of energy that we cannot see.

It’s invisible.

Can we touch it? No, we can’t.

We may get an electric shock. It’s dangerous.

Power stations

pylons

home

Do you know how electricity comes to us?

The pylons carry wires.

Wires carry electricity.

Electricity comes into our flats through thin wires, and

the thin wires are connected to thick wires. The thick

wires are called cables and they are buried

underground. Cables are connected to power stations.

Power stations make electricity.

Homework:1. Go over the vocabulary items and

recite them.

2. Listen to the recording of the article and read it aloud several times.

3. Finish Ex.C/ D / E on page 46, 47.

8B Chapter 4

A dangerous servant

8B Chapter 3

Ex. Fill in the blanks with proper words:

wire energy cable shock

1. Young people have more than old people.

2. Don’t touch the ! You’ll get an electric .

3. When the workers were digging up the road, they cut the

, and as a result, there was a blackout in the area.

a thread of metal

the power that makes things work

a thick, strong rope made of wire

a very strong force or blow

a period of darkness caused by a cut in the electricity supply

We can change electricity into energy that we can see, hear, or feel.

We can also change it into energy that move things.

light energy

sound energy

heat energy

movement energy(movement---moving or being moved)

Can you tell what kind(s) of energy do they produce?

Vocabulary

electricity n.

electric a. 电的，电动的，发电的 electric cables 电缆 an electric kettle 电壶 electric current 电流 electrical a. 电的，电气科学的 electrical appliances 电器 an electrical engineer 电气工程师 electrician n. 电工， 电学家

If any of the electrical appliances or the wiring in your home is out of order, you need to find an electrician to repair them.

1) When did the story happen?

2) Benny didn’t want to trick Daisy, did he?

3) Does Benny know what electricity is?

4) Why must we be careful with electricity?

5) How does electricity come into our homes?

6) What are the wires connected to?

7) What did Daisy buy for her brother?

8) Does Daisy know what electricity is?

9) How do batteries work?

10) What do you think of Benny and Daisy?

Read aloud the article and answer the following questions:

I. Complete the sentences:

1) It’s to touch the electricity with your hand. (danger)

2) We can buy sugar in . (pack)

3) He had no for why he was late. (explain)

4) Water. has three ---solid, liquid and gas. (form)

5) The thief the treasure under the tree. (bury)

6) In the old days, the rich usually asked to do the housework for them. (serve)

7) Tim works as a newspaper boy and he gets his pay from his boss . (month)

Homework:

II. Read and recite paragraphs 4~13.

III. Read and recite the words and expressions.

8B Chapter 4

A dangerous servant

8B Chapter 3

Public transport

train bus

underground

plane maglev train

phrases热能 / 电能 / 声能

动能 / 原子能

精力充沛的

不同形式的能量

一包信件

一盒 20 支香烟

终于

起先

埋电缆

在某种程度上

谨慎，小心

变成

欺骗，

heat energy / light energy / sound energy

movement energy / atomic energy

be energetic / be full of energy

different forms of energy

a packet of letters

a packet of 20 cigarettes

at last / in the end / finally

at first / at the beginning of

bury cables

in a way

be careful with / of

change into / turn into

trick somebody / play a trick(joke) on somebody

Fill in the blanks:fool battery happiness danger polite real produce

1. The trees can protect themselves by a chemical that makes their leaves taste nasty.

2. I’m sorry about my being late, sir.

3. What is , water or fire?

4. Would you like to get me some ?

5. Don’t always do such things.

6. He answered that question yesterday.

7. Although they are poor, they are .

join together

in the end

that cannot be seen

words that make sth. clear or say what sth. means

shapes or kinds

power that makes things work or makes people do things

put something or someone in the ground

a very wide smile

thick ropes of wire which electricity passes through

power that (comes through wires and) can make

heat, sound and light, and move things

a machine that tells you the amount used

(done or happening) every month

the glass part of an electric lamp that gives out light

Write out words or expressions according to their meaning.connect

at last

invisibleexplanation

formsenergy

bury

grin

cableselectricity

meter

monthly

a light bulb

　 Choose the right words to complete the sentences:

1. Playing with fire is very . (danger, dangerous)

2. Cables are connected (with, to) a power station.

3. Everyone (can, must) keep quiet in the library.

4. You need (a lot of, many) energy to play squash.

5. We get electricity from the power station (across, through) wires and cables.

6. The stars are (visible, invisible) when it’s cloudy.

7. People usually pay their rent (month, monthly).

8. He waited for the bus for an hour. (In, At) the end, it arrived.

9. I didn’t remember (what, how) Mr. Lee had asked me to do.

10. No one can be sure (what will man look like, what man will look like) in a million years.

Fill in the blanks with the verbs in their proper forms:

1. You’d better (not, take) it away.

2. The pen always (remind) me of my cousin, because it was sent to me by him.

3. The policeman ran up to the thief and (catch) him by the arm.

4. Our parents tell us (not laugh) at others.

5. The two cities (connect) by a new railway.

6. Did you hear what the child (explain) to you?

7. The energy of falling water can be used (produce) electricity.

8. It is the best novel I ever (read) before.

Complete the sentences with proper words or phrases:

1. Electricity is much than water.

2. Electricity a wire.

3. You must electricity because it is dangerous.

4. Will you this wire the television?

5. Don’t forget to the light before you leave the house.

6. You must change the bulb after you the electricity.

7. It’s raining hard. You water the flowers.

8. Must the boy copy the text today? No, . But he copy it tomorrow.

9. May I take the magazine out of the reading room? No, .

10. This book be Lucy’s. Look, her name is on the book cover.