【由内蒙古包头市201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。Millions of sports lovers are sill thinking about one thing----the Winter Olympics in Sochi Russia. close to 2900 men and women competed in the 2016 Winter Games about a month ago.

　　The Olympics brought a lot of attention to Sochi，a city on the black Sea, which is a popular area for vacation travelers. The area is known for its mild winters，with warm to summer.

　　At least 50 billion was spent on the 2016 Winter Games, making it the costliest Olympics in history. Seven billion dollars was spent on the 2010 Winter Games in Vancouver, Canada. Olympic officials chose Sochi to host the 2016 games almost seven years ago, At that time，Russian President Vladimir Putin said the games would cost about $13 billion. Yet times his estimate. So where did all the money go?

　　Some observers say the high cost is partly the result of security measures. Brian Jenkins，a terrorism expert from the RAND Corporation，gave the following explanation. 'There were anywhere between 70 ,000 and 100 , 000 policemen and military troops deployed around the city.

　　The main threat came from separatist and Islamist groups from the North Caucasus, especially from Chechnya and Dagestan. One group claimed responsibility for two suicide bombings in Volgograd last December. The attacks killed more than 30 people. The city is only about 600 kilometers away from Sochi.

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