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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?"

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