对于多组分样品的气相色谱分析，一般采用色谱柱室程序升温操作，如此操作的主要目的是（）

阅读理解

      In the United States, when one becomes rich, he wants people to know it. And even if he does not

become very rich, he wants people to think that he is. That is what “keeping up with the Joneses” is about. It is the story of someone who tried to look as rich as his neighbours.

      The expression was first used in 1913 by a young American called Arthur Momand. He told this story about himself. He began earning $ 125 a week at the age of 23. That was a lot of money in those days. He got married and moved with his wife to a very wealthy neighbourhood outside New York City. When he

saw that rich people rode horses,Momand went horseback riding every day.When he saw that rich people had servants, Momand and his wife also hired a servant and gave big parties for their new neighbours.

      It was like a race, but one could never finish his race because one was always trying to keep up. The

race ended for Momand and his wife when they could no longer pay for their new way of life. They moved back to an apartment in New York City.

      Momand looked around him and noticed that many people do things just to keep up with rich lifestyle of their neighbours. He saw the funny side of it and started to write a series of short stories. He called it

"Keeping up with the Joneses” because “Jones” is a very common name in the United States. “Keeping up with the Joneses” came to mean keeping up with rich lifestyle of the people around you. Momand’s series appeared in different newspapers across the country for over 28 years. People never seem to get tired of  keeping up with the Joneses. And there are “Jonses” in every city of the world. But one must get tired of

trying to keep up with the Joneses because no matter what one does, Mr. Jones always seems to be

ahead.

1. Some people want to keep up with the Joneses because they ________.

A. want to be as rich as their neighbours

B. want others to know or to think that they are rich

C. don’t want others to know they are rich

D. want to be happy

2. It can be inferred (推断) from the story that rich people like to ________.

A. live outside New York City

B. live in New York city

C. live in apartments

D. have many neighbours

3. Arthur Momand used the name “Jones” in his series of short stories because “Jones” is ________.

A. an important name    

B. a popular name in the United States

C. his neighbour’s name    

D. not a good name

4. If a person who keeps up with the Joneses, he would _________.    

A. do as the poor persons around him do    

B. do everything he likes to do    

C. do as his neighbours do     

D. do as the rich people around him do

复接设备由哪几部分组成？各部分的作用是什么？

下图是原尿中某种物质在流经肾小管形成尿液的过程中其浓度变化示意图。据此推断该物质是（  ）

A．水

B．无机盐

C．葡萄糖

D．尿素

根据《中华人民共和国未成年人保护法》的规定，引诱教唆强迫未成年人吸食注射毒品或卖淫的，应依法（）。

A.处罚

B.从重处罚

C.加重处罚

论证的规则“论题应当保持同一”是逻辑基本规律（）的要求。