题目

--Heard about the TOYOTA  Recall?   ---Yeah. ____ the measure, the car company is heavily influenced on its reputation. A. without   B. despite   C. besides   D. although 答案：B把下列个数填入相应的集合內：-7.5，，4，，，，0.31，-π，4.（1）有理数集合{______}；（2）无理数集合{______}；（3）正实数集合{______}；（4）负实数集合{______}．