题目

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。 Ray Charles Robinson, a blind musician in America, was famous for his records of jazz, rock 'n' roll, blues and country music. But the world knew him better as Ray Charles. He had an influence on American popular music. The song Let's Go Get Stoned is an example of Ray Charles' own kind of music—his own sound. He worked hard for several years to create that sound. No one ever tried it before. He mixed black church music, blues and rock 'n' roll. The sound was extremely successful. In the ninetee向量=（1，2），=（x，1），=+，=-，若∥，则实数x的值等于（ ）A．B．C．D．