题目

How do you get to Carnegie Hall(卡内基音乐厅)? Practice, practice, practice is the well known answer. But for some inspiring young musicians from the Afghanistan National Institute of Music in Kabul, the road to the famous concert hall was more difficult.The Afghan Youth Orchestra(AYO) is made up of young people who study at the Afghanistan National Institute of Music. It was the first orchestra created in Afghanistan in 30 years.Gulalai Norestani, 14, plays a traditional string instrument. Like many students. Gulalai became an orphan when her parents were killed during the ongoing war. 下列等式成立的是（　　）A．1÷（45÷23）=1÷45÷23B．1-（23+47）=1-23+47C．稻谷出米率+稻谷出糠率=1