题目

Kong Xiangdong, a famous classical ______________, always wanted to create something new. He _________? classical music with Chinese folk music. Music has always been part of Kong’s world. Since his mother was a music lover, he lived with music from ________________. However, his mother couldn’t buy him a piano so she had to draw piano keys? _________________? a piece of paper. The 5-year-old Kong would practice on the paper piano ________________? his mother clapped the rhythm. Although he thought about giving up because of too much practice, he didn’t? ________________ . He began to wi手电筒中使用的锌一锰干电池，在工作时反应的化学方程式为：Zn+2NH4Cl+2MnO2     ==ZnCl2+2NH3+X+H2O，其中X的化学式应为     A．MnO          B．Mn2O3        C．Mn3O4        D．HMnO4