1617 1st Term Christmas holiday homework

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Project learning:
Please note that the presentation has been postponed to after exam period (from 11/1 to 13/1). Please work together with your groupmate during the Christmas holiday.

Ch.4 Key Notes

P.23

1. The Earth is green and blue, and it is very beautiful.

2. Our daily activities produce a large amount waste, sewage discharges and exhaust fumes. They pollute the environment and affect the ecology. 

P.24 

1. Plastics bag, plastic knife and fork, straw, foam box, aluminium can and paper napkin.

2. Waste buried underground will decay and decompose after some time. 

P.25

1. Put the plastic bag and can into a garbage bin. 

2. Much waste is transported to the landfills.

3. Put the can into a recycling bin.

4. Aluminum cans for recycling. 

5. Save the plastic bag for future use. 

6. Reuse the plastic bag.

"What does this logo mean?"

This logo means the material of the product is recyclable, such as aluminium or some plastic.

P.26

1. B

2. A

3. D

4. C

2. Making toys with rubbish

P.22 Ways to save energy

1. Make use of the sunlight/ natural light
2. Turn off the light when they are not in use
3. Wash our hair in the morning so there is enough time for it to be dried (to avoid using the hair dryer)
4. Make use of solar power or renewable resources

Ch.3 Key notes

p.16
1.
In summer, he cooled the bed with a fan. In winter, he warmed the bed for his father with his body heat.

He cooked with firewood and lit up the room with an oil lamp.

p.16
2. May and her family use an air-conditioner in summer and an electric heater in winter. They cook with a gas stove and get light from an electrical lamp.
Modern life has all kinds of facilities.

p.17
1. We need to climb/ walk down the stairs.
2. We cannot iron our clothes.
3. The ice lollies will melt. The power cut may encourage bacteria to grow too.
4. We will feel hot.

p.18
LPG= Liquefied Petroleum Gas

Coal
1. From the dead plants, they form the coal layers (it takes a very long time for the layers to be formed)
2. Mine workers mine.
3. We burn coal to get energy (e.g. heat to cook food when we do barbecue)
4. Burning coal can bring exhaust fumes.

Petroleum 
1. From the dead sea animals
2.Their bodies lay at the bottom of the sea and become organic mud
3. Petroleum forms because of high temperature, pressure and compression
4. The drill extracts and refine petroleum to produce different fuel
5. The reserve can only last for 30 years.

p.20
Some appliances use more electricity, so the bill is more expensive.