A computer is a machine which manipulates data according to a list of instructions which makes it an ideal example of a data processing system.Computers take numerous physical forms. Early electronic computers were the size of a large room, consuming as much power as several hundred modern personal computers. Modern computers are based on comparatively tiny integrated circuits and are millions to billions of times more capable while occupying a fraction of the space. Today, simple computers may be made small enough to fit into a wrist watch and be powered from a watch battery. Personal computers in various forms are icons of the information age and are what most people think of as "a computer". However, the most common form of computer in use today is by far the embedded computer. Embedded computers are small, simple devices that are often used to control other devices — for example, they may be found in machines ranging from fighter aircraft to industrial robots, digital cameras, and even children's toys.
The ability to store and execute lists of instructions called programs makes computers extremely versatile and distinguishes them from calculators. The Church – Turing thesis is a mathematical statement of this versatility: Any computer with a certain minimum capability is, in principle, capable of performing the same tasks that any other computer can perform. Therefore, computers with capability and complexity ranging from that of a personal digital assistant to a supercomputer are all able to perform the same computational tasks given enough time and storage capacity.

B. Understanding the textDecide whether the following ideas are true or false (T/F) by referring to the text. T F
1. Computers are able to manage data according to a list of instructions. ( True)
2. The physical form of computer can not be changed.(False)
3. Early computers were very large and power-consuming.(True)
4. Modern computers are also very large and power-consuming.(True)
5. Personal computers are symbol of the information era.
6. Most people think that a computer is limited to a personal computer.
7. The embedded computers are rarely found in electronic devices.
8. Children may also be categorized as a computer user.
9. Computers and calculators are the same. 10. All computers may perform the same computational tasks.

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