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问题 单项选择题

ATM适配层的功能是______。

A．分割和合并用户数据

B．信元头的组装和拆分

C．比特定时

D．信元校验

答案

参考答案：A

解析： ATM适配层(AAL)负责处理高层信息，发送方把高层的数据分割成48字节长的ATM负载，接收方把ATM信元的有效负载重新组装成用户数据报。 21．

完形填空
根据对话内容，选择适当的句子补全下列对话。（其中有两项是多余的）
A: I `d like to see my grandparents in my hometown(家乡).
B: I wish you have a great time in Sanya.
C：How long does it take?
D: I am going to Sanya with my parents.
E: Please give my best wishes to them.
F: I am going there by plane.
G: Do you like to go there for you holidays?
 
Kangkang: Hi, Lily, Where are you going to go during the summer holidays?
Lily:   小题1:               
Kangkang: How do you plan to get there?
Lily:   小题2:                
Kangkang: When are you going there?
Lily: On July 6th. We will stay there for about a month..
Kangkang:   小题3:                  
Lily: Thanks. What about you, Kangkang?
Kangkang:     小题4:                . I miss them very much.
Lily: That`s good.    小题5:                   
Kangkang: Thanks.
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选择题

―Excuse me, Which is the way to the museum?

―Sorry, I don’t know. This is my ________ time here.

A．first

B．second

C．two

D．one
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