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| Three men were t 1 about the world's greatest wonders. The first man said, "I think the pyramids are the greatest. Though they were b 2 thousands of years ago, they are still standing. And just think: people at that time didn't have our modern m 3 . How could they build them so long ago?" "I a 4 that the pyramids are wonderful," the second man said. "But I think computers are more wonderful. Everyone knows computers have c 5 the world a lot since they were invented." Then the t 6 man said, "I agree with neither of you. I think the m 7 wonderful thing is the thermos (热水瓶)." The other two men were very s 8 . "A thermos!" they said. "Why? It's a simple thing." "Oh, no," the man said. "In w 9 you put in hot water and it stays hot. In summer you put in a cold drink, it stays cold. How does the thermos know whether (是否) it is winter o 10 summer?" 1._____ 2._____ 3._____ 4._____ 5._____ 6._____ 7._____ 8._____9._____ 10._____ |