Reading 1/1:
plastic bottles that nothing can destroy. Nor is it very easy to recycle plastics, as different types of plastic are often used in the same items and call for different treatments. Plastics can be made biodegradable by incorporating into their structure a material such as starch, which is attacked by bacteria and causes the plastic to fall apart. Other materials can be incorporated that gradually decay in sunlight - although bottles made of such materials have to be stored in the dark, to ensure that they do not disintegrate before they have been used.
23456789
1) Why was Celluloid invented?
A. Because people wanted to make knife handles, detachable collars and cuffs, spectacle frames, and photographic film.
B. Because people wanted to find another material for making billiard balls.
C. Because John Wesley wanted a competition.
D. Because people wanted to develop the film industry.
2) The use of celluloid in the 19th century made a great contribution to the
A. electrical components.
B. knife handles.
Next Question
C. film industry.
Next Reading
1
D. household items.
3) What is NOT true about Bakelite?
A. It was used to prevent heat and electricity.B. It was used to make household items.
C. It was invented by Leo Baekeland.
D. When it is softened and reshaped, it makes celluloid.
4) In the 1930s, what were bottles, pipes, and plastic bags made of?
polypropylene and PVC.
polythene and ethylene.
ABCD D.
polythene and polypropylene.
PVC and PTFE.
5) People first used nylon to make
A. parachutes.
