3 Read the article again and answer the questions. 1 Where does Minnesota get its biomass from?
2 What two benefits does using biomass have for
the environment?
3 Why is the sun so important in Australia?
4 What two results has the use of solar power had
in Australia?
5 Why has Britain got lots of sea and wind?
6 Which wind farm will produce more electricity?

1 Who worked out the theory of radio receiving devices?
2 What did A. Popov invent?
3 How did the invention affect radio devices?
4 What are the main parameters of radio receivers?
5 Does sensitivity mean a measure of the receiver's ability to receive weak signals?
6 Which parameter means the ability of the receiver to reject undesirable signals?
7 What does fidelity mean?
8 The principle of operation of the radio receiver is not very difficult understand, is it?
9  Are there various types of receivers?
10 Where are used communication receivers?
11 Are broadcast receivers used  in radio, telephone and telegraph service or in sound and visual programms?

I have got a sister, Kelly by name. I am 2 years older than my sister. Kelly and I are different. Her hair isn't as short as my hair. Kelly's nose is straight, and I've got a turned-up nose. My sister is a bit slimmer than I arm I think she is much more attractive than I because she looks like my mother, but I look like my father. He is very tall and I am the tallest in my class.
Kelly likes wearing smart bright clithes. She is choosing a dress at the moment. I don't care much for clothes and bon't like bright things.