男性，65岁，腹部疼痛5天，以右下腹为重，伴呕吐。检查：急性病容，右上腹饱满压痛，肌紧张，血白细胞14.8×10⁹/L，腹部透视可见少量气液平面。最可能的诊断是

A．急性肠梗阻
B．急性胆囊炎
C．阑尾周围脓肿
D．急性化脓性胆管炎
E．急性胰腺炎

有以下程序
#include ＜iostream＞
#include ＜string＞
using namespace std;
class base

private:
char baseName[10];
public:
base()

strcpy(baseName,"Base");

virtual char *myName()

return baseName;

char *className()

Return baseName;

;
class Derived: public base

private:
char derivedName[10];
public:
Derived()

strcpy(derivedName,"Derived" );

char *myName()

return derivedName;

char *className()

return derivedName;

;
void showPtr(base &p)

cout＜＜p.myName()＜＜" "＜＜p.className();

int main()

base bb;
Derived dd;
showPtr(dd);
return 0;

运行后的输出结果为

A．Derived Base

B．Base Base

C．Derived Derived

D．Base Derived