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4. As for plastics themselves, there are two kinds- those which
are affected by heat and those which are not, or cast plastics and
moulded plastics. Cast plastics are manufactured as liquid resins
and are then cast in the desired forms. Cast resins can be
coloured before being poured. The resulting plastics can be
produced in all sorts of colours, more than three hundred
different shades and colours, being now available in the cast
plastics.
5. Moulded plastics are usually mixed with “fillers” to
strengthen the finished material and give it certain
characteristics. The mixed materials are subjected to tremendous
pressure and temperature until they flow and fill the mould.
Since the great heat used destroys dyes, moulded plastics can be
in only a few shades, usually black.
6. The greatest advantages which plastics are expected to give
the world is that they will make the people no longer dependent
upon nature for their materials. Chemists look upon the
invention of plastics as marking the beginning of the time when
they will be able to control more fully the atoms and molecules
which compose all material things.
б) Прочитайте текст еще раз. Выберите правильный
ответ, соответствующий содержанию текста:
1. Moulded plastics are usually mixed with “filler” to:
a) destroy certain characteristic
b) raise the temperature of moulded plastics
c) strengthen the finished material
8. Moulded plastics can be produced in only:
a) one colour
b) in all sorts of colours
c) a few shades usually black
3. The greatest advantages which plastics may give the world is
that:
a) they are entirely the product of modern chemistry
b) they make people no longer dependent on nature’s
products
c) they are subjected to great pressure
VII. Перепишите и письменно переведите 2, 3 и 4 абзацы
текста.
Вариант 3
I. Перепишите и подчеркните слово, не соответствующее
синонимическому ряду.
Образец: large – small – big – great
1. application – usage – utilization - production
2. quantity – amount – quality - number
3. complex – difficult – easy - complicated
4. enterprise – plant – factory - theatre
5. to realize - to think - to believe - to go
II. Перепишите и соотнесите следующие слова с их
значениями.
1. component
2. term
3. density
4. complex
5. automation
6. mind
7. enterprise
a. methods and machines to save labour
b. consisting of related parts; composite
c. a part of an object
d. relation of weight to volume (in physics)
e. a person who makes plans something
sketches, models
f. a plant or a factory
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