1).Information in the form instruction......a program.
a) will be calling b) have called c) is called
2) The user... data into computer to get information as an output.
a) inputs b) shall input c) have inputed
3) Computers.........a new era in manufacturing.
a) are opened up b) opened up c) have opened up
) Nowadays computers......from 800 to over 3000 million operations per second.
a) can perform b) could perform c) will be able to perform
5) Computer speeds......in Hertz.
a) have been measured b) are measured c) were measured
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̲Ͳ ² , IJ
ò Ͳ
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5.05070104
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1 Read and translate the text
Energy
In the language of science energy is the ability to do work. There are various forms of energy, such as heat, mechanical, electrical, chemical, atomic and so on. There are two kinds of mechanical energy - potential, the energy of position, and kinetic, the energy of motion.
We know very well that one form of energy can be changed into another. The energy of falling water is generally used to turn the turbines of hydroelectric stations. The turbines in their turn drive the electric generators and their produce electric energy. Thus, the mechanical energy of falling water is turned into electric energy. The electric energy, in its turn, may be transformed into any other necessary form.The sources of energy are either chemical, as in the battery, or mechanical, as in the electromagnetic generator, chemical sources of current have a limited application, that's why the great quantities of electric energy generated today come from various forms of mechanical energy.
2 Answer the questions
1). What is energy?
2) What kinds of energy do you know?
3) Can one form of energy be changed into another form?
4) Is potential energy the energy of motion?
5) Can the energy of falling water be used to drive turbines?
3 Match the sides.
| 1.To change one form of energy into another | 1. |
| 2.To drive the electric generators | 2. 㳿 |
| 3.To turn the mechanical energy into electric energy | 3. |
| 4.To lose the potential energy | 4. |
| 5.To have a limited application | 5. |
4 Make up the sentences
1). called, energy, is, to, capacity, work, do.
2) exists, in energy, variety, a, forms, of.
3) has, potential, water, energy.
4) matter, energy, any, possesses.
|
|
|
5) current, is, a, electric, of, energy, form.
5 Choose the right variant
). Potential energy... the energy of a mass due to its position.
a) was b) were c) is
2) Energy of some kind.........to generate the electric current.
a) must be employed b) may be employed c) have been employed
3) Light generator...a form energy.
a) been b) were c) is
4) The generator... mechanical energy into electrical energy.
a)changed b) changes c)change
5) The energy needs of the world.......
a) will increase b) have increased c) are increasing
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_________
________ ______________ 2012
̲Ͳ ² , IJ
ò Ͳ
ֲ Ͳ Ͳһ
5.05070104
17
