1 . Find out some key words in Activity 2 of the book and guess what they will be talking about.

Ben Drake, an expert on air pollution, is being interviewed on the radio. He said that smog was a severe problem in the early 20th century in Britain. At that time, Britain was experiencing a boom in industry. Factories and homes used lots of coal, which created smog. He also mentioned the heavy smog in London was particularly bad and caused over 4000 deaths in 1952. Later the UK government restricted burning coal   in homes and forced factories to move away from city centers. As smog is harmful to everyone, the expert advised us to replace coal with cleaner forms of energy, use new energy-efficient vehicles and further develop green technology.

1. The expression “    1    ” originated in Britain and means a     2    of “smoke” and “fog”.
2. Smog became a severe problem in Britain because people at that time burnt lots of    3    .
3. The worst smog in British history happened in London in 1942.
4. The Great Smog of London claimed 5,000 lives.
5. Later, the UK government ordered people not to burn     4    in their homes.
    5