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阅读下列短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项。
George Markov was a famous writer in Bulgaria．In 1969, he suspected(疑心) that he was going to be put into prison or killed because one of his plays was regarded as being an attack on the leaders of Bulgaria．Markov managed to reach England and got a job with the BBC, preparing broadcast in Bulgarian．
Some of the BBC broadcasts were critical of life in Bulgaria．Perhaps as a result of this, Markov received an anonymous telephone call warning him that he would be killed．In September 1978, Markov stopped his car in London and started to walk to his office．When he was passing a bus line, a man in the line appeared to drop his umbrella．Markov felt a sudden pain in the leg．
When Markov reached his office, he spoke about the accident to a friend．A few hours later, he began to feel ill．He was sent to hospital and died four days later．The doctor examined his body, and they were puzzled about the cause of his death．Scientists were asked to help and they found a tiny metal pellet(小球) in Markov’s leg．There were two tiny holes in the pellet, and scientists believed that there had been an unknown poison in them．
A few weeks before Markov was”shot”with poisonous pellet fired from an umbrella, another Bulgarian had the same experience in France．Towards the end of August 17, Kostov felt a sharp pain in the back when he was leaving a railway station in Paris．He was ill for a few weeks but became well．When the news of Markov’s death became known, Kostov was asked to return to hospital for examination．Doctors found a tiny pellet in his back, but it had stuck in an area which the poison had not been able to spread．
The police in both countries are still searching for the reasons why both men were attacked．They hoped to catch their attackers．
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