99 . нужна презентация на . темы: 1. персональный компютер. 2. создания пк. 3. аппаратное обеспечение пк. чем больше - тем луче.

The History of Computer DevelopmentThe rapidly advancing field of electronics led to construction of the first general-purpose electronic computer in 1946 at the University of Pennsylvania. It was Electronic Numerical Integrator And Computer or ENIAC, the device contained 18,000 vacuum tubes and had a speed of several hundred multiplications per minute. Its program was wired into the processor and had to be manually altered.Later transistors appeared. The use of the transistor in computers began in the late 1950s. It marked the advent of smaller, faster elements than it was possible to create with the use of vacuum-tube machines. Because transistors use less power and have a much longer life, computers alone were improved a lot. They were called second-generation computers.Components became smaller and the system became less expensive to build.Modern digital computers are all conceptually similar, regardless of size and shape. Nevertheless, they can be divided into several categories on the basis of cost and performance.The first one is the personal computer or microcomputer, a relatively low-cost machine, usually of desk-top size. Sometimes they are called laptops. They are small enough to fit in a briefcase. The second is the workstation, a microcomputer with enhanced graphics and communications capabilities that make it especially useful for office work. And the server computers, a large expensive machine with the capability of serving the needs of major business enterprises, government departments, scientific research establishments. The largest and fastest of these are called supercomputers.A digital computer is not actually a single machine, in the sense that most people think of computers. Instead it is a system composed of five distinct elements: a central processing unit, input devices, memory storage devices, output devices and a communications network, called a «bus» that links all the elements of the system and connects the system itself to the external world.

1) Tim hadn't three bananas yesterday

Had Tim three bananas yesterday?

2)We have five English books

We have not five English books

Have we five English books?

3)The woman has a very nice dress

The woman hasn't a very nice dress

Has woman a very nice dress?

4)The child will has a new beautiful toy tomorrow

The child will not has a new beautiful toy tomorrow

Will child has a new beautiful toy tomorrow?

5)I have seven cousins

I have not seven cousins

Have I seven cousins?

6)In two weeks you have two beds in your room

In two weeks you have not two beds in your room

Have you In two weeks two beds in your room?

7)Three years ago Ann had a nice black piano

Three years ago Ann had not a nice black piano

Had Ann  a nice black piano three years ago?

8) Diana and George have four children

Diana and George have not four children

Have Diana and George four children?

9)Jane have two uncles

Jane have not two uncles

Have Jane two uncles?

10) They have eight beautiful flowers

They have not eight beautiful flowers

Have they  eight beautiful flowers?

1 I with my friend will visit my grandmother in Janjary

2 I sure that they will be good friends

3Who will buy milk, bread and vegetables tomorrow?

4 He will go to the library after lunch

5 Will you come to my birthday?

6 When will he be at home?

7 I will need to work very much

before the exam

8 She will end the university in a year and she will become economist

9 He won't come to you evening because he will be busy

10 We must go in 10 minutes, otherwise we will late

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