Номер 1, страница 110 - гдз по английскому языку 5 класс (starlight) учебник Баранова, Дули

Module 6. Have you ever ...?. 6i. Curricular: Science - номер 1, страница 110.

Условие.

К этому заданию есть аудио

1 Look at the picture. How do you think a mobile phone network works?

Listen to and read the text to find out.

Mobile Phone

Network

Millions of people around the world use mobile phones to keep in touch with friends and family, and there is an 80% chance that you've got a mobile phone in your pocket or bag. Have you ever wondered, though, how a mobile phone network works?

A mobile phone is actually a sophisticated radio that uses radio waves to communicate, like a really good walkie-talkie. A walkie-talkie uses one channel and one frequency, so only one person can talk at the same time. The mobile phone uses two frequencies, one for talking and one for listening, which means both users can talk at the same time; and it can use over 1600 channels.

When your mobile phone is on, the phone communicates to what we call a base station. A base station is a special antenna which can be on the top of a building or a communications tower. There are usually hundreds of base stations in cities all over the world. Sometimes telephone companies disguise their base stations, so you don't even notice them. Each base station is at the centre of an area called a cell. All calls and messages in that area go to the cell's base station where a special base station controller transmits the call. Controllers can only take a certain number of calls at the same time, so if a lot of people call, some of them may not be able to get through. This doesn't happen very often though because there are antennas everywhere. Keep an eye out for them!

Check these words

keep in touch, sophisticated, frequency, base station, antenna, cell, transmit

Did you know?

It is possible to locate a mobile phone user to a couple of metres anywhere on the planet.

Решение.