世界上海外华人最集中的地区是（  ）

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   English is one of my s  ____  at school. I like it very much. I have learned it for three years. It is not easy to learn, but it is very i  ____ for us.
   English is the most widely spoken language in the world. People in different c  ____  often use English to talk with each other. Our country has opened its door to the world. More a ____  more people come here as travelers or on business . So English is getting common in our country. Of course, I must learn it w  ____    .
   English will be u   ____  to me after I leave school. If we want to do business with foreigners, we must know English, because most of them speak and write English. In the world, most science b  7 are written in English. I am learning English so that I can learn much k  ____ . After I have learned English, I can r   ____   short stories in English. I can also sing many English songs. English helps me e ____ myself after class.

关于声现象，下列说法正确的是（）