阅读理解+阅读七选五+完形填空(一)阅读理解阅读下列短文,从每题所给的A、B、C和D四个选项中,选出最佳选项。A May:Happenings from the Past May 5, 1884 Issac Murphy,son of aslave and perhaps the greatest horse riderin American history,rides Buchanan to win his first Kentucky Derby. He becomes the first rider ever to win the race three times.