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V. Explain why the following things are made or covered with polymers. Name the properties of polymers, which are important in making these things.

Product

Property

plastic bottles for acids or cleaning fluids in your home

light weight (as compared with paper or metal)

electrical appliances, cables, electrical outlets and wiring

sufficient strength

microwave cookware and the handles of kitchen utensils

thermal insulation

car bodies, the frame structure of space stations

electrical insulation

portable phones and portable computers

resistance to chemicals

shopping plastic bags and packaging

resistance to corrosion

cups, plates, spoons and forks refrigerators and coolers

easy processing

picnic tables and fences decorations and toys

energy and cost efficiency

bulletproof vests vinyl windows

easy recycling

resistance to shock

VI. Comment on the following statement.

"The usefulness of plastics can only be measured by our imagination-These are definitely the materials of past, present, and future genera­tions."

VII. Annotate the text.

21.

Automotive Problems

The Participle

Cooling Systems

Lead-in

I. Discuss the following questions.

a) Are you good at repairing cars?

b) What are the most common faults in a car?

c) Do you know how to repair them?

II. Listen to the students' conversation and learn what faults can occur in a car.

Peter: Alex, I would like you to have a look at my car, please.

Alex: What's wrong with it?

Peter: I don't know. Having just started the engine stops again.

Alex: There is no petrol in the tank, I'm afraid.

Peter: On the contrary! The tank is full and the battery seems to be in order.

Alex: Let's go into the garage then and ask Denis to have a look at it. He is said to be a good car mechanic and is sure to find the fault in your car.

Peter: OK. Considering the situation, we are going to need his help.

(couple of hours later)

Peter: What are you busy with?

Denis: I'm repairing the engine of your car.

Peter: But what has happened? It's quite new as far as I know.

Denis: Don't you understand that you should never operate the engine if the air filter is out of order? Well, having entered the engine, dust and dirt damaged the cylinders, pistons and piston rings.

Peter: OK, I get it, I should have changed the filter.

Denis: Yes. By the way, have you ever checked your spark plugs?

Peter: Let's see… But they are as good as new!

Denis: Certainly, they are all right. Having cleaned and tested them, I only have to repair the engine now.

Peter: Oh, now it's clear why there was no spark.

Denis: And there wouldn't be. Being covered with oil the spark plugs will not give a spark. That's why your engine stops.

Peter: I see.

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