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______是C++语言程序的人口。

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Mark Twain was an American writer. One day he went to a city by train. He wanted to see one of his friends them. He was a very busy man. He usually forgot something. When he was in the train, the conductor asked him for his ticket. Mark Twain looked for his ticket here and there, but he couldn’t find it. The conductor knew Mark Twain. She said, "Show me your ticket on your way back. And if you can’t find it, it doesn’t matter." "Oh, but it does," said Mark Twain. "I must find the ticket. If I can’t find it, how can I know where I am going\ Mark Twain is ______.

A. a Frenchman
B. an English
C. an American

请按下面注释的提示，将类B的构造函数定义补充完整。class A int a;public: A(int aa=0) (a=aa; ];class B: public A int b; Ac;public: //用aa 初始化基类A,用aa+1初始化类对象成员c B(int aa): 【9】 b=aa+2;

传统的Internet提供的是没有QoS保证的、尽力而为的服务。其实在lPv4包中已经定义了服务类型字段，包括优先级、吞吐量、延迟、可靠性等，只要 (23) 处理该字段，就可提供QoS保证。MPLS是一种更通用的QoS保证机制，其基本思想可简述为 (24) 。

A. 交换机
B. 路由器
C. 服务器
D. 客户端

具有止血、抗炎、抗菌、抗瘤等作用的是

A. 紫草素
B. 丹参醌Ⅰ
C. 大黄素
D. 番泻苷A
E. 大黄素蒽酮