试题与答案

简述采用IP承载方式时：MGW之间的IPBCP消息不能直接发送给对端，需要经过Mc和

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题型：问答题 简答题

题目：

简述采用IP承载方式时：MGW之间的IPBCP消息不能直接发送给对端，需要经过Mc和Nc接口的隧道进行传送，请描述建立承载的三种方式和他们的主要区别。

答案：

参考答案：

一、采用IP承载方式时三种承载建立方式：前向快速、前向延迟、后向延迟。

二、差别：

（1）快速和延迟的差别在于，快速方式中，承载建立请求消息直接通过IAM消息发送给对端，所以只有快速前向，没有快速后向；

（2）延迟方式中，承载建立请求消息是通过后续的APM消息发送给对端的。

（3）、前向延迟中信令建立的方向与承载建立的方向一样。后向延迟中信令建立的方向与承载建立的方向相反。

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题型：阅读理解

阅读理解

       Not long ago,people thought babies were not able to learn things until they were five or six months

old.Yet doctors in  the United States say babies begin learning on their first day of life.

       Scientists note that babies are strongly influenced by their environment.They say a baby will smile if

her mother does something the baby likes.A baby learns to get the best care possible by smiling to please

her mother or other caregivers.This is how babies learn to connect and communicate with other human

beings.

     One study shows that babies can learn before they are born.The researchers placed a tape recorder

on the stomach of a pregnant woman.Then,they played a recording of a short story.On the day the baby

wasborn,the researchers attempted to find if he knew the sounds of the story repeated while in his mother.They did this by placing a device in the mouth of the newborn baby.

      The baby would hear the story if he moved his mouth one way.If the baby moved his mouth the other way,he would hear a different story.The researchers say the baby clearly liked the story he heard before he was born.They say the baby would move his mouth so he could hear the story again and again.

      Another study shows how mothers can strongly influence social development and language skills in

their children.

      Researchers studied the children from the age of one month to three years.The researchers attempted

to measure the sensitivity of the mothers.The women were considered sensitive if they supported their

children's activites and did not interfere unnecessarily.They tested the children for thinking and language

development when they were three years old.Also,the researchers observed the women for signs of

depression.

      The children of depressed women did not do as well in tests as the children of women who did not

suffer from depression.The children of depressed women did poorly in tests of language skills and

understanding what they hear.

       These children also were less cooperative and had more problems dealing with other people.The

researchers noted that the sensitivity of the mothers was important to the intelligence development of their

children.Children did better when their mothers were caring,even when they suffered from depression.

1．According to the passage,which of the following is NOT the factor that influences the intelligence

     development in babies?

A．The environment. 

B．Mother's sensitivity

C．Their peers (同龄人). 

D．Education before birth.

2．What is the purpose of the experiment in which newborn babies heard the stories?

A．To prove that babies can learn before they are born.

B．To prove that babies can learn on the first day they are born.

C．To show mothers can strongly influence the intelligence developent in their babies.

D．To indicate early education has a deep effect on the babies' language skills.

3．Which group of children did the worst in tests of language skills?

A．The children of depressed mothers who cared little for their children.

B．The children of women who did not suffer from depression.

C．The children of depressed but caring mothers.

D．Children with high communication abilities.

4．What is the main idea of the passage?

A．Scientific findings about how babies develop before birth.

B．Scientific findings about how the environment has an effect on babies'intelligence.

C．A study shows babies are not able to learn things until they are born or six months old.

D．Scientific findings about how intelligence develops in babies.
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