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问题 单项选择题

Networks can be interconnected by different devices. In the physical layer, networks can be connected by （） or hubs, which just move the bits from one network to an identical network. One layer up we find bridges and switches, which operate at data link layer. They can accept （） , examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer, we have routers that can connect two networks. If two networks have （） network layer, the router may be able to translate between the packet formats. In the transport layer we find transport gateway, which can interface between two transport connections. Finally, in the application layer, application gateways translate message （） . As an example, gateways between Internet e-mail and X.400 e-mail must （） the e-mail message and change various header fields.

Finally, in the application layer, application gateways translate message（）

A．syntax

B．semantics

C．language

D．format

答案

参考答案：A

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完形填空。
     A new term has begun. Teachers are   1   about the fact that new students are not easy to handle. They
like to bring cellphones and MP3 players to school. What is   2  , some students even use cellphones to do
with out-of-class matters in class, or sometimes just for fun. Some other students listen to MP3 players
when they are having a lesson that they are not interested in.
     Are these new students really that   3  ? "Yes," says Delaney Kirk, a professor at Drake University.   4   
she adds it's not their fault. Instead, the things that they bring into school-cellphones, MP3 players and so
on-and the teachers are to blame. Kirk first began thinking about students' manners six years ago. "I had my
first class in which students were sleeping or talking to each other. It seemed that learning well   5   nothing
to do with them," she says. "At first, I got worried about this, but then I said to myself, 'You're teaching   6  ,
and you need to manage this … These students need to know more about manners. It's time to help them
develop some good   7  . They shouldn't waste time doing nothing when they are young. Sooner or later, they
might regret the time they have wasted.'" 
     Kirk also   8   a list of suggestions to help teachers better manage their classes. The following are among
her suggestions:
     ● Tell students how they will benefit by taking the class. On the first day of class, emphasize its
importance   9   giving some homework that students must turn in next time.
     ● Do not allow them to bring cellphones and MP3 players to the class at all.
     ● Decide  10  formal and informal the class will be.
( )1. A. excited   
( )2. A. bad     
( )3. A. rude    
( )4. A. But     
( )5. A. learned   
( )6. A. management 
( )7. A. ideas    
( )8. A. makes    
( )9. A. of       
( )10. A. what   		B. worried   
B. worse    
B. polite   
B. However 
B. did    
B. English   
B. speeches      
B. brings   
B. on      
B. how     		C. surprised 
C. good      
C. friendly 
C. And    
C. had    
C. Chinese       
C. habits   
C. gets    
C. at   
C. which   		D. interested
D. better      
D. curious 
D. Therefore                          
D. shared    
D. lessons     
D. classes   
D. takes     
D. by      
D. why       
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单项选择题

与国际形态分类法中的大小结节混合型肝硬化相对应的是（）

A.胆汁性肝硬化

B.门脉性肝硬化

C.淤血性肝硬化

D.寄生虫性肝硬化

E.坏死后性肝硬化
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