阅读理解。
Three men travelling on a train began a conversation about the world's greatest wonders.
"In my opinion," the first man said, "the Egyptian (埃及的) pyramids ( 金字塔) 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 (机械) 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 (计算) that would
take a person a hundred years to do.
Then the second man 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 (惊叫). "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 _____.
A. fridge
B. air-conditioner
C. electric fan
D. bottle which can keep liquids hot or cold
2. The three men could not agree on what the world's greatest wonder was because _____.
A. they couldn't think of anything really wonderful
B. they all had different criteria (标准)
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 in Egypt
C. they had been built with every 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
nothing before falling. 
