题目

If boy wizard Harry Potter uses his magic to capture the hearts of millions of teenagers, high school students Gabriella and Troy have charmed American boys and girls with their stories of campus life.        They are the leading characters in High School Musical, a series of hugely successful films in the US. The sequel （续集）, High School Musical 3, came out on October 24 and has topped the American box office for two straight weeks.        The show has everything attractive to teenagers—dancing, catchy music, puppy love and good looks. The story starts when high school b经过点A（1，-2）的反比例函数解析式为（　　） A、y=2xB、y=-2xC、y=1xD、y=-3x