试题与答案

图示电路,欲求出电路中各支路的电流,根据基尔霍夫电流定律能列出的独立结点电流方程和根

题型:单项选择题

题目:

图示电路,欲求出电路中各支路的电流,根据基尔霍夫电流定律能列出的独立结点电流方程和根据基尔霍夫电压定律能列出的独立回路(取网孔为独立回路)电压方程分别为()。

A.1个节点电流方程,4个回路电压方程

B.2个节点电流方程,2个回路电压方程

C.4个节点电流方程,1个回路电压方程

D.3个节点电流方程,2个回路电压方程

答案:

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参考答案:A

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题型:阅读理解

阅读理解。

     I live in Hollywood. You may think people in such an attractive, fun-filled place are happier than others.

If so, you have some mistaken ideas about the nature of happiness.

     Many intelligent people still equate happiness with fun. The truth is that fun and happiness have little or

nothing in common. Fun is what we experience during an act. Happiness is what we experience after an act.

It is a deeper, more abiding emotion.

     Going to an amusement park or a ball game, and watching a movie or television, are fun activities that

help us relax, temporarily orget our problems and maybe even laugh. But they do not bring happiness, because

their positive effects end when the fun ends.

     I have often thought that if Hollywood stars have a role to play, it is to teach us that happiness has nothing

to do with fun. These rich, beautiful individuals have constant access to glamorous parties, fancy cars,

expensive homes, everything that spells "happiness".

     But in memoirs (回忆录), celebrities reveal the unhappiness hidden beneath all their fun: depression,

alcoholism, drug addiction, broken marriage, troubled children and profound loneliness.

     The way people stick to the belief that a fun-filled, pain-free life equates happiness actually reduces their

chances of ever obtaining real happiness. If fun and pleasure are equated with happiness, then pain must be

equated with unhappiness. But, in fact, the opposite is true: More times than not, things that lead to happiness

involve some pain.

     As a result, many people avoid the very endeavors that are the source of true happiness. They fear the pain

inevitably brought by such things as marriage, raising children, professional achievement, religious commitment,

civic or charitable work, and self- improvement.

1. What does the author want to tell us?

A. He lives in Hollywood, so he feels unhappy.

B. The true meaning of happiness.

C. In fact, famous people are not very happy.

D. Happiness is not equal to fun.

2. What is many intelligent people's viewpoint about happiness?

A. Happiness just means having fun.

B. Happiness is not equal to fun.

C. Happiness means doing what you like.

D. Happiness means being rich.

3. What does the underlined word "equate" in the second paragraph mean?

A. compare

B. think

C. similar or connected

D. match

4. According to the passage, the author may agree ____.

A. amusement park can bring us happiness

B. fun will bring some happiness to us

C. pain will bring us happiness

D. efforts can bring us happiness

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