首字母填空。（10分）
Three men were t__小题1:__ about the world’s greatest wonders.
The first man said,” I think the pyramids are the greatest. Though people b__小题2:__ them thousands of years ago, they are still standing. And just think: people at that time didn’t have our m__小题3:__ machines(机器). How could they build them so long ago?”
“I a__小题4:__ that the pyramids are wonderful.” The second man said. “ but I think computers are more wonderful. Everyone knows computers have changed the world a lot since people i__小题5:__ them.”
Then the t__小题6:__ man said, “ I d__小题7:__ with you two. I think the most wonderful thing is the thermos(热水瓶).”
The other two men were very s__小题8:__ , “ A thermos!” They said. “ Why? It’s a simple(简单) thing.”
“Oh, no,” the man said.” In w__小题9:__ you put in hot water and it stays hot. In summer you put in a cold drink and it stays cold. How does the thermos know w__小题10:__ it is winter or summer?”