dumargarita

24.04.2020 08:53 •  Английский язык

, сделать в письменном виде. Раздел 1

I.Прочитайте текст «Metals»
In general, metals are solids with a metallic luster, conductors of electricity, malleable, and of high physical strength. In compound of the metals have positive valences. Probably their most important characteristic is that when used as metals they are predominately in elemental from or alloyed with other metals.
The metals long used by mankind – iron, copper, zinc, tin, lead, mercury, silver and gold – are those which are easily reduced from compound to elemental form.
The most important metal, iron, is both prevalent and easily reduced to metallic form. In more recent times some of the most naturally prevalent metals that are difficult to reduce have become common and readily available due to the development of electrochemical processes for their production. These include aluminum, magnesium and sodium.
The metals occur most commonly as oxides or sulphides in ores contain variable amounts of gangue materials like clay, granite, etc, from which the metallic, compounds must be separated.
Since only a few of the metals, such as copper, gold, silver, platinum and bismuth, exist naturally in elemental form, the chief problems is that of reducing them from compound to elemental form.
Some of the more common reduction methods include:
a)pyrometallurgical;
b)electrolytic;
c)metal replacement.
Выполните тест на понимание содержания прочитанного:
1.The metals long used by mankind:
a)aluminium, magnesium, sodium
b)iron, copper, silver, gold.
2.In compound form the metals have:
a)positive valences
b)negative valences.
3.Metals exist naturally in elemental form:
a)sodium, potassium, iron
b)copper, silver, gold, platinum.
4.Metals, produced by electrochemical process:
a)gold, platinum, iron
b)aluminium, magnesium, sodium
5.The most important characteristic of metals:
a)good conductivity of electricity, metallic luster, high physical strength
b)low physical strength, liquids at room, temperature, low malleability.
II.Соедините слова и словосочетания с переводом
1.Carbon a)лезвие
2.Alloy b)Углерод, уголь
3.Blade c)сплав
4.Cutting tool d)Сварка, спайка
5.Welding e)не поддающийся коррозии, нержавеющий
6.Inclusion f)Режущий инструмент, резец
7.Affect g)Включение в состав, присоединение
8.Silicon h)Оказывать воздействие
9.Rust-Proof i)Кремний, силикон
V.Вставьте в предложения подходящее по контексту слово:
improve device invent amount produce
1.This large of money permitted Mister Edison to start his own company.
2.He announced that the company would existing telegraph devices and work on new inventions.
3.Mister Edison told friends that his new company would a minor device every ten days and what he called a "big trick" about every six months.
4.He said that if someone needed a to do some kind of work, just ask and it would be invented.
Раздел 2
VI.Выберете правильный вариант ответа:
a)
1 Danny is a very good runner. I’m sure he …………… through to the final.
A will get B get C got
2. Lisa is nervous and upset. She …………………her camera.
A lost B has lost C will lose
3. Last year she …………… in competition.
A takes part B took part C will take part
4. Now she ……………. an e-mail to her friend.
A writes B is writing C wrote
5. The population in Moscow is …………….. than in Wellington.
A large B larger C the largest
6. I was born … 2000.
A in B on C at
b)
7.She says that playing computer games (is/are) interesting.
8.She (is/am) nervous when she (has/have) exams.
9.Can I speak (to/with) Claire, please?
10.I tried my best and took (part/place) in the World teenagers’ competition.
11.We (were/are) out of luck yesterday match.
12.He always (help/helps) his nephew with his homework.