艾滋病的病原体是（）
A. * * 多瘤空泡病毒
B.HTLV-1反转录病毒
C.朊病毒感染
D.HIV病毒
E.巨细胞病毒
参考答案：D
My sister has learnt English _________.
A．for twelve years ago
B．since she was four
C．twelve years ago
D．at the age of four
在下面程序的下划线处填上正确的数据类型，保证程序具有如下输出结果：01717，17，17源程序如下：#include < iostream >using namespace std;class base{public : ______________num; base ( ) { } }; int base::hum = 0; void main( ) { cout << base::num << endl; _________________* p=&base : :num; *p=17; cout << base::num << end1; base a,b; cout << * p<<"," << a. hum << "," <
