问题 单项选择题

光纤的单位长度上的损耗可用()表示

A.db

B.db/km

C.dB.km

答案

参考答案:B

阅读理解

阅读理解。

     One day a person met Socrates and said, “ Do you know what I just heard about your friend?”

"Hold on a minute ,” Socrates replied. “Before telling me anything I'd like you to  pass  the  Filter

(过滤) Test.” “Filter Test?” “Yes.” Socrates continued. “Before you talk to me about my friend, it

might be a good idea to filter what you're going to say. That's why I call it the Filter Test. The first filter

is Truth (事实). Have you made sure that what you are about to tell me is true?” “No, in fact I just

heard about it and...” “ All right,” said Socrates. “So you don't know whether it's true or not. Now let's

try the second filter, the filter of Goodness (好处). Is what you are about to tell me about my friend

something good?” “ No, quite the opposite...” “So," Socrates continued, “you want to tell me something

bad about him, but you're not certain if it's true. Now there's one filter left: the filter of Usefulness

(有用). Will what you want to tell me about my friend be useful to me?” “No, not really. ” “Well,” said

Socrates, “if what you want to tell me is neither true nor good nor even useful, why will you tell it to

me?”

       We can always join in loose talks(闲话). But when it comes to our friends, it's not worth it. Never

talk behindthe back about our near and dear friends.

1. What should the man do before he told something to Socrates?

______________________________________________________

2. How many filters were there in Socrates' test?

______________________________________________________

3. The person wanted to tell Socrates something _____    _______about his friend.

4. Did Socrates know what the person wanted to tell him at last?

______________________________________________________

5. This passage tells us that _______________________.

多项选择题 案例分析题