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    Tony, a 14-­year-­old Chinese school boy, lives in Guangzhou with his parents. Tony is his English name. Tony began to love computer games three years ago.

    Every day, he spends most of his time playing computer games. Usually he plays until midnight in his room. But his parents don't know. And he never takes sports. What's more, he loves junk food very much. He eats it more than four times a day. Bad lifestyle makes him unhappy. He is tired in class. So he can't study well. And he is often ill. Yesterday he had a fever and cough, and he didn't go to school.

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    A very important world problem is the growth of population on the earth. The population of the world today is more than 6,500,000,000. That is a great number and we know it quite well. ①The important thing is not how large the population of the world is now, but is the rate(速度) of the growth. It is about 1.63% every year after the number of dead people has been taken away.

    To give you some ideas of the birth rate, look at the ②second hand of your watch. Every second, four babies are born in the world. Another baby! Another baby! Another baby! Another baby! ③You can not speak quickly enough to keep up with the rate of the growth of the population. It is growing faster and faster. So it goes on, hour after hour. In one day, people have to find food for about 350,000 mouths more.

    This great growth of population will make a big problem by the year 2050 — there will be as many as 7,500,000,000 people on the earth! So this is one of the biggest problems that you are going to meet in your life.

    A girl named Mary was killed at around 6：20 p. m. on a rainy day. Somebody found her on a street and called the police. The next day, the police got four suspects(犯罪嫌疑人). The police asked them the same question, "What were you doing at around 6：20 p. m. yesterday？"

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