题干

在100的水完全变成100的水蒸气的过程中(  )

A:水分子的平均动能增加

B:水分子的势能减少

C:水分子的动能和势能都增加

D:水汽的内能的增加比吸收的汽化热少

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D

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    If you are given only 1 yuan, can you live in a city for one day? It may be a little difficult. But 1 from Xi'an did it.

    On April 10th, more than 60 students from the Middle School Attached to Northwestern Polytechnical University 2 the One Yuan Metropolis Survival. The charity for teenagers called Imperceptible Education held this 3  .  Students had to live and they had to deal with a lot of  4  tasks. It has happened in eight cities and is going to four others, including Beijing, in May.  

    To  5  , many students looked for part-time jobs and saw how hard life was. Zhang Qiyue, 14, asked more than 10 restaurants for a job and 6   got one chance. "We were sad when they said   7  . But slowly, we got used to it," he said. After being a waiter for an hour, he 8   25 yuan.

    Some made use of their talents  9  singing and dancing in parks or shopping malls. Many people who walked by took notice and helped   10  . Zhao Jiacheng, 14, drew pictures and made paper crafts (手工). "This showed it's  11 to learn a special skill," he said.

    Living was hard,    12 finishing the tasks was not any easier. They went to different places to finish tasks in a  13  time. The most amazing one was when they had to exchange things worth a hundred yuan with only a piece of paper in half an hour. "We learned  14   to persuade (说服) others. From a balloon to a cake to a bottle of yogurt……, after almost 20 tries, we got an expensive necklace, "he said, "we would   15 all of the money we had raised to poor schools in Tibet."