已知“int *p=malloc（100）；”，要释放p所指向的动态内存，正确的语句为（）。 A: Afree（p）； B: Bfree p； C: Cfree（*p）； D: Dfree；

Economist often say there is no such thing as afree lunch. What do economists mean whenthey say such a thing? A: Economists,in this case, are talking about common resources. B: Someresources cause significant negative externalities. C: Even ifsomeone literally offers you a free lunch, there is an opportunity cost to theresources that are used to produce your free lunch. D: Peoplenever offer a lunch for free.