题目

阅读下面短文根据其内容写一篇60词左右的内容概要。 Do you ever notice the music playing when you enter a store? No? Often it is very difficult to point out. It is similar to the music you listen to, but it is not the same. The music played in stores is changed to be more relaxing and to give you more mental energy. This style of music is called “elevator music.” Elevator music is also referred to as Muzak. Muzak is very commonly listened to in the USA. About 1/3 of Americans will listen to Muzak for about 15 minutes a day in order to relax themselves. The music is play1．在复平面内，复数z=i（1+i），那么|z|=（　　）A．1B．$\sqrt{2}$C．$\sqrt{3}$D．2