题目

阅读短文，判断下列句子与短文内容是否相符 Today is Friday. I'm going to the supermarket this afternoon. I'm going to buy some food and a comic book. Tomorrow morning I'm going to Guangzhou for a trip. I'm going there by train. I'm going to read my new comic book on the train. The day after tomorrow I'm going to Kunming by plane from Guangzhou. In Kunming, I'm going to see folk dances and eat snacks. I'll be very happy this holiday.【1】I'm going to buy some food tomorrow. （____）【2】I'm going to take a trip next Friday. （____）【3】I'm going to Guangzhou by trai8．已知函数①f（x）=x+1；②f（x）=2x-2；③f（x）=$\frac{1}{x}$；④f（x）=lnx；⑤f（x）=cosx；其中对于f（x）定义域内的任意x1，都存在x2，使得f（x1）f（x2）=-x1x2成立的函数是（　　）A．①③B．②⑤C．③⑤D．②④