问题 单项选择题

下列______不是广播信道的通信子网采用的基本拓扑结构。

A.环型

B.网状型

C.树型

D.总线型

答案

参考答案:B

解析: 考查网络拓扑分类方法。广播信道通信子网的基本拓扑构型有4种:总线型、树型、环型、无线通信与卫星通信型。B) 不是4种拓扑结构之一。目前广域网主要采用网状拓扑构型。

选择题
阅读理解

阅读表达。

     [1]Why can't I get it done?

     [2] This is one question millions of people over the globe ask themselves every now and then. It is not

as if you are not working hard, but you simply may not know that there is a difference between work and

productivity. Your plan is what gives you a clear picture of what you are aiming at, but the method of

achieving may vary from time to time. That you did not meet up with a deadline does not mean you were

not working on it. The problem is whether you will be able to manage time.

     [3] Before you start on the next activity, task or project, first ask yourself why you want to do what

you are about to do now. You will by this be able to know if the task should be done, and if the timing is

right.

     [4] Doing the right thing at the wrong time makes it absolutely wrong. So it is not just enough to do

what is right, also consider           . Your time has value, when you spend it on what is right at that instance. On the other hand, the value of your task is when   it   is done at the right time.

     [5] You will feel sorry about the time spent on what was not profitable to you. Time can not be

wasted, because it can not be preserved and replaced. You are always doing something with your time.

What matters is the value of what you are doing at the moment with your time.

     [6] The desire to make a difference begins with the ability to take the right decision on what to do. It

will become simple if you learn to manage time effectively.

1. What is the main idea of the text? (within 10 words)

                                                                             

2.  Fill in the blank in Paragraph 4 with proper words. (within 10 words)

                                                                              

3. Complete the following statement with proper words. (no more than 5 words)

You will regret           doing things which were of no value to you.

                                                                            

4. What should be the first step to get some work done? (within 12 words)

                                                                              

5. What does the underlined word "it" (line 3, paragraph 4) probably refer to? (no more than 3words)