题目

Every day we go to school and listen to the teacher,and the teacher will ask us some questions.Sometimes,the classmates will ask for your opinions of the work of the class.When you are telling others in the class what you have found out about these topics,remember that they must be able to hear what you are saying.You are not taking part in a family conversation or having a chat with friends—you are in a slightly unnatural situation where a large group of people will remain silent,waiting to hear what you have to say.You must speak so that they can hear you—loudly enough and clear如图所示，曲线分别为指数函数的图象， 则与1的大小关系为                                    A．       B．   C．        D．