题目

听材料，回答问题。 （1） What time is it now? A . 7:40 a.m. B . 11:40 a.m. C . 12:00 p.m. （2） What will the man do next? A . Have something to eat. B . Wait at the skating area. C . Learn how to use the skates. 答案：B A有理数a等于它的倒数，有理数b等于它的相反数，则a1998+b1998=（　　）A．0B．1C．-1D．2