ответить на 5 вопросов. сделайте .

2. wireless communications (b)allow people greater flexibility while communicating. 3. a microphone converts(a) messages(b), like sounds(b) or other data, into electronic impulses.(b) 4. all wireless communication devices(b)use radio waves(b) to transmit and receive signals.(b) 5. the transmitter uses(a) an oscillator to generate radio waves.(b) 6. construction and utility workers(b)often use hand-held radios (b)for short-range communication and coordination. 7. simple two-way radios(b), called walkie-talkies(b), have been popular children’s (1)toys(b) for years.(b) 8. an example of a device that sends(a)one-way transmission is a pager, which is a radio receiver. 9. aircraft pilots(b) use radios(b) to communicate with air traffic controllers (b)at airports.(b) 10. a device that functions(a) both a transmitter and a receiver is called a transceiver. 11. speakerphones(b) allow callers’ (1)hands(b) to be free.