题目

Dear Susan, I'm very gladly to hear you are coming to visit me                                1 the next Friday. Unfortunately, I won't be able to meet you at the                   2 airport although I have classes in the afternoon. You                             3 won't find difficult to get to the city center. The                                 4 airport bus leaves every 30 minute and will take                                 5 you rightly to the曲线与直线及所围成的封闭图形的面积为(   )A．B．C．D．