单项选择题

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From the end of the 1700s, Kentucky had a special problem: horseracing. There weren’t many special tracks for horseracing then, so people would take their horses to the main square and race them. This was quite dangerous for the people who were walking around! Meriwether Lewis Clark, Jr. established the Kentucky Derby. After visiting England and studying England’s racetracks and races, he built a racetrack in Louisville, Kentucky, which he named Churchill Downs. On May 17, 1875, the first Kentucky Derby was held. Until 1895, the distance around the track was 1 miles. Since 1895, the Derby track has been 1 miles. Before 1902, the Derby was very popular, but it was not financially successful. It underwent some changes in ownership, and had its first profit in 1903. By 1920, the Derby had become the best-known race in North America. Today, the race attracts the best three-year-old horses from all over the country. The Kentucky Derby is held each year on the first Saturday of May. The whole week is full of fun activities. The event attracts over 100 000 visitors, and is watched on television around the world.

How long is the current racetrack

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