Реферат: Ветствует тексту.

Radio is a special kind of long-distance electrical communications. It makes pos-

sible to send different signals such as dots and dashes of the Morse code (radio-te-

legraphy), speech and music (radio telephony), images of objects and films (televi-

sion). Radio helps us to maintain contact with ships, with aircraft in flight or a spa-

cecraft. Radio helps us to detect an aircraft flying high above the clouds (radio lo-

cation, or radar) and measure the distance to it. Space stations photographed, on a

command transmitted by radio from the Earth, the hidden side of the Moon and sent its pictures back to the Earth.

Daily radio programmes include lectures, reports and concerts. Radio is a powerful means of spreading knowledge.

a) Long-distance electrical communications c) The Morse Code

b) Radio Programmes d) Radio Today

Задание № 9 Прочитайте текст .

Radio communication is the transfer of high-frequency energy from the transmit-

ter to the receiver without wires.

Radio is a device that transmits and receives signals and programs by electro-

magnetic waves. Since the process of radio communication includes transmission and reception of signals, the necessary components of radio are a transmitter and a

receiver.

The transmitter is a device that produces radio-frequency energy. The main parts of a transmitter are a high-frequency oscillator including an oscillatory circuit and

one or more amplifiers. In modern transmission electron tubes are used to amplify

currents and give greater transmitting range and better reception.

The receiver is a device that receives waves sent out by a transmitter. Radio rece-

iver demodulates these waves and they are heard as speech, music and signals.

9.1 Закончите предложение:

The transmitter is a device that… .

a) receives waves sent out by a transmitter

b) produces radio-frequency energy

c) transmits and receives signals and programs by electromagnetic waves

d) transfers high-frequency energy from the transmitter to the receiver

9.2 Найдите соответствующий перевод подчеркнутого слова:

a) так как c) с тех пор

b) с d) с тех пор как

Задание № 10 Прочитайте текст.

Telephony is the transmitting of speech over a considerable distance by means of electric current, using wires. Telephony communication includes 1) telephone sets to change sound energy into electrical waves and back again, 2) transmitting

system to carry electric waves over any distance, and 3) switching system to con-

nect any two telephone sets. Telephone is a device for reproducing sounds over considerable distances. Telephone set includes a transmitter and an electric net-

work in addition to the receiver. The transmitter transmits sounds and the receiver receives them. The receiver includes a telephone and a microphone. Both the mi-

crophone and the telephone are linked to a common circuit with an apparatus at the

other end of the line.

10.1 Ответьте на вопрос:

What is telephone?

a) It is the transmitting of speech over a considerable distance.

b) It is the switching system.

c) It is the device.

d) It is the transmitter.

10.2 Определите, какой из заголовков соответствует тексту:

a) Telephony c) The Receiver

b) Telephone Sets d) The Transmitter

Задание № 11 Прочитайте текст и заполните пропуски 1-4 предложе-