Nanjing is      beautiful city. It is     capital of Jiangsu and      city has many beautiful parks.

A．a; the; a

B．the; the; a

C．a; the; the

D．the; a; the

有如下程序：
#include＜iostream)
using namespace std；
classBase
public：
Base(int x＝0)cout＜＜x；
；
Class Derived：public Base
public：
Derived(int x＝0)cout＜＜x；
private：
Base Val；
；
int main()
Derived d(1)；
return 0；

A．100

B．000

C．010

D．001