完形填空 When my wife, who is Spanish, spent her first winter in London a few years

完形填空

When my wife, who is Spanish, spent her first winter in London a few years ago, she used to ask me time and again：“Where’s the fog?”Almost all foreigners 1 to find the city full of yellow – grey fog for most of the years．Dickens, who was 2 responsible for painting this 3 in people’s minds, certainly wasn’t joking in those days．In the nineteenth century people used to say 4 someone attempted to kill himself by 5 into the Thames, he would be choked by the fog and poisoned by the terrible 6 of the river before he had time to drown himself．In fact, the situation has 7 only in recent years．When I was a boy in London thirty years ago, I was often unable to see 8 of the road when I left home on winter mornings．

The key steps that have turned London into one of the 9 cities in the world were 10 at the end of the 1950s．But Londoners still find it 11 that fog hardly returns．Actually the 12 took place as a result of two main improvements．Factories were forced to fix equipment for air cleaning 13 close down, and local people were not allowed to 14 coal unless it was smoke – free．But the 15 incredible miracle in London occurred 16 1964 when the Thames Water Authority began to pump vast 17 of dissolved oxygen into the river．18, varieties of fish that had gradually disappeared from the Thames since 1800 have 19, and some are 20 caught by fishermen outside the House of Parliament(议会)．

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