计算题

1. What percentage of area is shaded?

Answer: _                                                          .

2. If a group of 6 people have an average age of 21,  and each person is half the age of the next person,

    what are the ages of the 6 people?

Answer: _                                                           .

以下程序的输出结果是 long fun(int n) { long s； if(n==1‖n==2)s=2； else s=n-fun(n-1)； return s；} main() {printf("%1d\n"，fun(3))；}

A．1

B．2

C．3

D．4