问题 填空题

由于在多媒体网络应用中需要同时传输语音、数字、文字、图形与视频信息等多种类型的数据,不同类型的数据对传输的服务要求不同,因此多媒体网络应用要求网络传输提供高速率与低【 】的服务。

答案

参考答案:延迟(或时延)

解析:多媒体网络应用对数据通信的要求主要表现在以下几个方面:高传输带宽要求;不同类型的数据对传输的要求不同;网络中的多 媒体流传输的连续性与实时性要求;网络中多媒体数据的低时延要求;网络中的多媒体传输同步要求;网络中的多媒体的多方参与通信的特点 。

选择题
阅读理解

阅读理解。

     High school was wonderful, but I had always felt uncomfortable as one of the taller members of my class,

standing a head above the other girls and stooping (弯腰) at the back of the line to avoid sticking out.

     I especially hated being around large groups of people like during the social hour after the church services.

     My grandfather would watch me grow increasingly uncomfortable, but he didn't laugh at me or try to

comfort me. Instead, he would warn me. "Stand straight and tall," he'd say, as I tried to shrink (退缩).

     And each time, I would obey him. Even at age 15, I understood that his advice was about more than just

feet and inches.

     My grandfather grew up in war-torn Europe. When German soldiers took his hometown, the beautiful and

exciting city of Tarnow, Poland, he joined the Soviet army for his country's freedom. "Stand straight, stand

tall," meant something else back then. I trusted my grandfather more than anyone else in my childhood. And

whenever I was afraid of something, he would tell me stories of his life.

     After the war, he took a boat for America on January 27,1947. All alone in a new country, he was

frightened about his future.

     Still, he marched head-on in the streets of New York. Soon he met other European immigrants, each of

them trying to find his or her own way.

     If they could do it, why couldn't he? "Stand straight, stand tall," he would told himself. 

     At first my grandfather retused to enter an American church. He was angry with God for the loss of his

whole family back in Europe. But soon he felt his self-confidence returning. When he walked into the church

that first time, he walked in proudly.

1. Which can best serve as the title for the text?

A. Stand straight, stand tall

B. My grandfather's stories

C. Height brought me trouble

D. My unforgettable high school

2. The writer didn't like attending social activities because _____.

A. her grandfather didn't allow her to attend

B. other people didn't like making friends with her

C. her height made her feel uncomfortable

D. she thought she was too young to join in

3. The part "his advice was about more than just feet and inches." underlined in Paragragh 4 means that her

    grandfather advised her _____.

A. to grow up quickly

B. not to worry about height

C. to pay attention to her body shape

D. to be brave and proud