题目

If you have ever been in a school play or even made believe you were a doctor, detective, or a space traveler, you know the enjoyment that acting brings. Almost all of us have the wish to play the part of someone or something else.    16    In the ancient world, acting was often associated with religious ceremonies and other special occasions. As far back as 2200 B.C, trained Chinese actors performed ceremonial dances in costume and makeup at harvest festivals.    17     To the dance was gradually added pantomime—the imitation of movements and gestures as well as the we3．已知函数f（x）=3sin（$\frac{π}{4}$-ωx）（ω＞0），定义域是[0，π]，f（x）相邻两个零点之差的绝对值为$\frac{π}{2}$，则函数f（x）的单调递减区间是（　　）A．[0，$\frac{3π}{8}$]B．[$\frac{3π}{8}$，$\frac{7π}{8}$]C．[0，$\frac{3π}{8}$]和[$\frac{7π}{8}$，π]D．[$\frac{7π}{8}$，π]