小红早晨起床照镜子，她在镜子中看到的像是虚像[ ]

旅游客源地大多是发展中国家和地区。(　　)

阅读理解。

        To take good notes, you need to be able to do two things very quickly: first, you must understand main

topic; second, your hand must work as fast as your ears so that you can write down as much information as

possible.

        You don‘t have to learn how to write down what you hear. But you do need to practice a few simple skills

to help you to be good at note-taking. Also, you should learn how to write only the most important words in

short forms from each sentence without taking notice of the rest. 

        In the old days, people sent telegrams to each other. When they did it, they had to pay by the word, and it

was expensive. That is why they sent very short telegrams which included only the most important words.         Let’s compare these two examples:

     ●"I will be arriving tomorrow, Monday, April 15,on TWA flight number 222, at JFK airport."

     ●"Arrive 15th TWA 222 JFK"

         Which would be more expensive? 

         When you take notes, you have a similar problem. In this case it is not money, but time. For that reason,

it is a good idea to practice listening for only the most important sentences, and only the most important words

in those sentences.

根据短文内容完成下面各题。

1. To take good notes, first, you must understand main ______.

2. Second, your hand must work as ______ as your ears.

3. Also  you should learn how to write only the important  words  ______ from each sentence.

5. The writer's purpose is ______.

液力耦合器有哪些优点？

下列选项中属于正则表达式的是( )。

A．一个数组

B．一组二进制数

C．一个字符串

D．一个公式