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Coal, oil, natural gas, and all other fuels are stored energy from the sun. Some was collected by this season's plants as carbon compounds. Some was stored by plants and trees ages ago. Even waterpower derives from the sun. Water turned into vapor by the sun falls as rain. It courses down the mountains and is converted to electric power. Light transmits only the energy that comes from the sun's outer layer, and much of this energy that is directed towards the earth never arrives. About nine tenths of it is absorbed by the atmosphere of the earth. In fact, the earth itself gets only one half millionth of the sun's entire output of radiant energy.
The sun is the source of all of the following EXCEPT______.
A．gasoline
B．natural gas
C．atomic power
D．animal fat
The plane smple harmonic longitudinal wave with frequency of
= 1.25
Hz travels along a slender metal rod. The elasticity modulus of the rod is
and its density is
How much is the wavelength of the longitudinal wave?
A、0.1m
B、0.2
C、0.3
D、0.4
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| It was the afternoon of December 24, the day before Christmas；and as the newest doctor in our office, I had to work. The only thing that1my day was the beautifully decorated Christmas tree in our waiting room and a2sent to me by a fellow I was dating - a dozen long-stemmed red roses. Then I was told a lady3needed to speak with me. As I stepped out, I noticed a young, tired-looking woman with a4in her arms. Nervously, she5that her husband - a prisoner in a nearby prison-was my6patient. She told me she wasn't7to visit her husband in prison and that he had never seen his8. Her request was for me to let the boy's father sit in the waiting room with her as9as possible before I called him for his appointment. I agreed.10, it was Christmas Eve. Her husband arrived-with chains on his feet and hands, and two armed guards. The woman's tired face11like our Christmas12when her husband took a seat beside her. After almost an hour, I called the13to my office. At the end of the14, I wished him a Merry Christmas - a(n)15thing to say to a man headed back to prison. He16and thanked me. He also said he felt17by the fact he hadn't been able to get his wife anything for Christmas. On18this, I was inspired with a wonderful idea. I'll never forget the look on both their faces as the prisoner gave his wife the beautiful19. I'm not sure who experienced the most joy - the husband in giving, the wife in20, or myself in having the opportunity to share in this special moment. | ||||
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Directions: Read the following passages carefully. The passage is followed by some questions or unfinished sentences. For each of them there are four choices marked A, B, C, and D. Choose the best answer to each question. Questions 1 to 5 are based on the same passage. Gender differences are also reflected in the ways that men and women use language. In junior high school, Joy's status will depend on her circle of friends. If her friends are popular, then Joy may enjoy high status at schools. For this reason, Joy and many other girls are interested in gossip, talking about other people and their private lives. If Joy has some information to share about a popular girl at school, this proves that she has a friendship with this girl. In this way Joy can use gossip to gain more status in her school. Tommy, on the other hand, may be less interested in gossip. His status doesn't depend on who his friends are at school. Tommy gains status through his own ability to play sports well or earn high grades. Later in life, Joy may continue to be interested in talking about other people and their lives. Tommy will be less interested in personal talk and more concerned with discussions of sports and news. These give him a chance to gain status by showing others his knowledge. Different ways of speaking are part of gender. As adults, men and women sometimes face difficulties in their communication with each other. Studies of communication show that if a woman tells her husband about a problem, she will expect him to listen and offer sympathy. She may be annoyed when he simply tells her how to solve the problem. Similarly, a husband may be annoyed when his wife wants to stop and ask a stranger for directions to a park or restaurant. Unlike his wife, he would rather use a map and find his way by himself. Language is also part of the different ways that men and women think about friendship. Most men believe that friendship means doing things together such as camping or playing tennis. Women, on the other hand, usually identify their best friend as someone with whom they talk frequently. Moreover, they often use tag questions to get agreement from their friends. If men and women can understand their differences, they may be able to improve their relationships. Question 1 is based on the above passage. Why are girls interested in gossip?
A、Gossip teaches them how to act.
B、Gossip allows them to use commands.
C、Gossip brings them high status.
D、Gossip helps them know about their friends.
下列物质在一定条件下都可以作为氧化剂：KMnO4，K2Cr2O7，CuCl2，FeCl3，H2O2，I2，Br2，F2，PbO2。试根据标准电极电势的数据，把它们按氧化能力的大小顺序排列，并写出它们在酸性介质中的还原产物。
(1)Fe+Cu2+===Fe2++Cu
(2)Ni+Pb2+===Ni2++Pb
(3)Cu+2Ag+===Cu2++2Ag
(4)Sn+2H+===Sn2++H2
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