Three men traveling on a train began a conversation about the world's greatest wonders.
　　“In my opinion,” the first man said, “the Egyptian pyramids are the world's greatest wonder. Although they were built thousands of years ago, they are still standing. And remember: the people who built them had only simple tools. They did not have the kind of machinery that builders and engineers have today.”
　　“I agree that the pyramids in Egypt are wonderful,” the second man said, “but I do not think they are the greatest wonder. I believe computers are more wonderful than the pyramids. They have taken people to the moon and brought them back safely. In seconds，they carry out mathematical calculations that would take a person a hundred years to do.”
　　He turned to the third man and asked, “What do you think is the greatest wonder in the world？”
　　The third man thought for a long time，and then he said, “Well，I agree that the pyramids are wonderful, and I agree that computers are wonderful, too. However，in my opinion, the most wonderful thing in the world is this thermos.”
　　And he took a thermos out of his bag and held it up.
　　The other two men were very surprised. “A thermos？”they exclaimed. “But that's a simple thing.”
　　“Oh, no，it's not, ”the third man said. “In the winter you put in a hot drink and it stays hot. In the summer you put in a cold drink and it stays cold. How does the thermos know whether it's winter or summer？”
　　1.The underlined word “thermos” means in Chinese “ _____ ”.
　　A.电冰箱 B.洗衣机 C.电风扇 D.保温瓶
　　2.The three men could not agree on what the world's greatest wonder was because _____.
　　A. they could not think of anything very wonderful　　B. they all had different ideas
　　C. they could not prove that their opinions were right　　D. the journey ended too soon
　　3.The first man thought the pyramids were the most wonderful things in the world because _____.
　　A. they were very beautiful　 　B. they were Egyptian
　　C. they had been built with very simple tools　　D. they could do mathematical calculations
　　4.The third man thought a thermos was the most wonderful thing in the world because _____.
　　A. it lasted longer than the pyramids 　　B. it cost less than a computer
　　C. he thought it knew whether it was winter or summer
　　D. the other two men were surprised when he told them about it
　　5.The third man was not very clever because _____.
　　A. he could not think of anything to say　　B. he did not understand how a thermos works
　　C. he did not think the pyramids were wonderful D. he did not know anything about computers
    【答案与解析】三个人在谈论世界上伟大的奇观。其中的一个人认为修建于几千年前的金字塔是最让人叹服的世界奇迹。其理由是：当时只有简单的原始工具，并没有我们现代化的设备和技艺精湛的工程师。第二个人则认为电子计算机金字塔更为奇妙。因为在它们的控制下人类已经登上月球并安全返回，并且计算机的运算速度实在惊人。第三个人的观点非常独特，他认为暖水瓶是最让人不可思议的发明。其他两个对他的话感到十分诧异。问其原因时，那人却说：冬天，把热水倒进去，它就能保温；夏天把冷饮倒进去时，它就能保持冰凉。它怎么知道是夏天还是冬天？”
　　1.D.最后一段：“冬天往里装热饮料，它能保温；夏天往里装冷饮料，它能保冷。”由此可猜测出thermos意为“保温瓶”。本题选D正确。
　　2.B.通读全文可知，对于“世界上最大的奇迹是什么”这一问题各有各自的观点，故本题选B正确。
　　3.C.第二段后两句即本题答案出处。本题选C正确。
　　4.C.本题选C正确，由短文最后一段可得出此答案。
　　5.B.从最后一段可知，第三个人对于保温瓶保温的原理不懂。故本题选B正确。