For the child experiencing excessive vomiting secondary to pyloric stenosis, the nurse should assess the child for which of the following acid-base imbalances

A. Respiratory alkalosis.
B. Respiratory acidosis.
C. Metabolic alkalosis.
D. Metabolic acidosis.

有以下程序：
# include＜stdio.h＞
main()
char*p,*q;
p=(char *)malloc(sizeof(char)* 20);q=p;
scanf("%s %s",p,q);printf("%s %s\n",p,q);

若从键盘输入;abc def＜回车＞,则输出结果是 ______。

A．def def

B．abc def

C．abe d

D．d d