Вопрос № 223490 - Английский язык

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Approximately one third of our life is spent asleep but when I started to think about sleep, I realized that my mind was completely blank. One day I went to spend a weekend with Dr Hernandez, director of the local Sleep Laboratory.
First of all I wanted to know why we sleep. Dr Hernandez said: “Well, years ago we didn’t really know, but recent science has shown that people who don’t sleep enough soon get ill and often die.”
I wondered if our bodies experience any changes while we sleep. Dr Hernandez replied: “In some stages of sleep the heart rate and our breathing slow down but in other stages the opposite happens – the heart rate increases and our breathing becomes quite rapid. During the night our body temperature drops by one or two degrees too.”

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When a number of 1_______________ are hooked up in series so that the output of one serves as the input to the next amplifier stage, the function of the early stages is usually  2______________  the voltage to a high 3_______________, while the last stage builds up the power to a level sufficient to operate an output device. Audio amplifiers amplify electrical ac signals that have a frequency range corresponding to the range of human hearing, or from about 20 to 15,000 cycles per 4________________.

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There is a state service in Britain called the National Health Service (NHS). Anyone can go see a GP and this costs nothing. (The service is free for foreigners too in an emergency.) If the doctor thinks you need some medicine, he writes you a prescription, which you take to the chemist’s. Most people have to pay a small charge for a prescription. Although medical treatment, including hospital treatment, costs NHS patients almost nothing, there are some problems: you often have to sit in crowded waiting rooms with a lot of ill people; doctors and nurses are overworked; people may have to wait for months for a minor operation because there aren’t enough hospital beds. People who have serious illnesses, however, get immediate medical treatment.

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Some people go to private doctors to get private treatment, though this is expensive.
Health service isn’t paid for in the United States. There is no government health service. People buy insurance, but it doesn’t pay for everything. Hospital rooms can cost as much as two hundred dollars a day, and very often the patients have to buy their own necessities. Sometimes they pay for their treatment for the rest of their lives.

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Doctor Lennox is a radio doctor. She answers listeners’ questions about medical problems.
Hello, Doctor Lennox. Well, three days ago I fell over and cut my arm. There was a little blood, but it quickly stopped and I forgot about it. Now the wound is painful and red. It hurts when I touch it. I also think I may have a fever. I feel a little hot and quite weak. Do you think I should see my doctor?

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Doctor Lennox is a radio doctor. She answers listeners’ questions about medical problems.
Doctor Lennox, I am a 43-year-old woman. A few months ago, I was walking upstairs when I suddenly felt very faint and almost fell over. Now, whenever I do just a little exercise I get out of breath very quickly. Even when I’m sleeping, I have breathing problems. I wake up in the middle of the night and can’t get back to sleep. I’m really worried because I have never had insomnia in my life before. I don’t have a pain in my chest, so I don’t think I have heart problems. I’m very worried. What do you think?