问题 选择题

已知石墨所具有的总能量比金刚石所具有的总能量低.据此判断,下列说法中正确的是(  )

A.由石墨制备金刚石是吸热反应;石墨比金刚石稳定

B.由石墨制备金刚石是吸热反应;金刚石比石墨稳定

C.由石墨制备金刚石是放热反应;石墨比金刚石稳定

D.由石墨制备金刚石是放热反应;金刚石比石墨稳定

答案

石墨所具有的总能量比金刚石所具有的总能量低,则由石墨制备金刚石是吸热反应,物质具有的能量越低越稳定,石墨比金刚石稳定.

故选A.

阅读理解

任务型阅读

     We often make a handshake in business and in life in China.It often takes place when you meet

someone new and when you leave a party or a meeting.

     People are supposed to shake hands in many countries.But every country has its own custom of

shaking hands, so you need to know something about another country's handshaking custom before you

visit it.

     Here are some of the most usual handshaking customs around the world:

★In England you shake hands whenever you meet someone, even if you know them well.

★Russians shake hands often.However, they never shake hands while wearing gloves.

★A strong handshake and holding hands closely are signs of welcome in South Africa.

★Men in Arabian cultures prefer a long handshake.At the same time, they will say a few words to

greet the other person.

★The French always shake hands in business meetings.In social situations, they kiss each other on the

face.

★People in India and Pakistan shake hands by holding your hand in both their hands.

     It is considered impolite to refuse to shake hands with someone.But don't worry if someone refuses

to shake hands with you, because there may be some special reasons.For example, maybe they have a

cold or don't feel very well.A person that is unable to shake hands should always say sorry and explain

for it so that the other person does not feel unhappy.

1. 判断正误(T表示正确,F表示错误)

( ). People are supposed to shake hands in many countries.

2. Russians never shake hands while _________________________________________.

3. In social situations what are the French supposed to do when they meet people?

    ___________________________________________________________________

4. Who prefer shaking hands by holding your hand in both their hands?

     ___________________________________________________________________

5. 将文中划线句子译成汉语。       

    ___________________________________________________________________

问答题 简答题