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Opera started in Italy. Mozart was a famous opera composer(歌剧作曲家).He wrote The Marriage of Figaro.

Antenna(天线)is used for radio, television, radar and so on. It worked very well in the past, and it is still very useful now.

Washington D. C. is the capital of the USA. It is much smaller than New York in population(人口)and size. But it is as important as New York.

Now we buy things in supermarkets and shopping centres. But before we bought food and clothes in markets. A long time ago, each town had only one or two markets.

The Sears Tower is in Chicago. It was one of the tallest build. It is about 442 metres.