题目

缺词填空 Chinese pianist Lang Lang arrived at 56th Grammy Awards (格莱美奖) at Staples Centre on Sunday, January 26,2014, in Los Angeles. L  1   every successful person, Lang went through years of hard and lonely practice before he became f  2  . With great talent, he won his first competition at 5. When he was nine, Lang went to learn music in Beijing. Then came the difficult time. “ I got fired by the piano teacher six months l  3  . My piano dream was destroyed,” Lang said. Learning the son’s failure, Lang Lang’s father was s  4   angry that he even tol若关于x的一元二次方程的两个根为x1=1,x2=2,则这个方程是(　　) A．， B．， C. ， D．；