题目

We all often deal with people who complain about the failures and troubles of their daily lives. Life   41   to be full of problems for them. I would like to think such a life   42    unusual. If there were no problems in your job, then your   43   would hire a much less capable(有能力的) person than you to do the things that don’t   44   much thought. In the business world, those who are able to solve difficult problems are the ones who are the most   45   to the employer. Many times the problems or challenges we face   46   us to grow and become more 在2KMnO4＋16HCl2KCl＋2MnCl2＋5Cl2↑＋8H2O反应中氧化剂与还原剂物质的量之比为 [　　] A． 1∶8 B． 8∶1 C． 1∶5 D． 5∶1