有如下语句序列； int k=0; do{k+=5;couk＜＜'$';) while(k＜19)； while(k--＞0)cout＜＜'*'； 执行上面的语句序列输出字符$和。的个数分别是

A．4和20

B．5和20

C．4和21

D．5和21

All of the following are examples of a source of scope change EXCEPT ______ .

A) a variation in government regulations
B) failure to include a required feature in the design of a telecommunication system
C) discovering a need to engage in bottom-up cost estimating
D) introducing technology that was not available when scope was originally defined