Safety in Numbers（在线收听）

    Whenever King Xuan of the state of Qi ordered his musicians to play yu，an ancient wind instrument consisting of reed pipes，he al－ways insisted on three hundred musicians playing together．Nanguo，an educated man in retirement，asked for permission to play yu forthe king．The king graciously gave his consent and Nanguo received the same salary as the other several hundred musicians．After the death of King Xuan，King Min became the ruler of the state of Qi．He liked to listen to the musicians playing one by one．Nanguo fled．Exercises：
    回答下列问题：
    ① Who was Nanguo？
    ② Why did Nanguo flee？
    ③ Can we learn something from Nanguo？