例文：Killer bees started in Brazil 1957. A scientist in Sao Paulo wanted bees to make more honey(蜂蜜). So he put forty-six African bees with some Brazilian bees. The bees bred(繁殖) and made a new kind of bees. But the new bees were a mistake. They didn’t want to make more honey. They wanted to attack. Then, by accident, twenty-six African bees escaped and bred with the Brazilian bees outside.

　　Scientists could not control(控制) the problem. The bees increased fast. They went from Brazil to Venezuela. Then they went to Central America. Now they are in North America. They travel about 390 miles a year. Each group of bees grows four times a year. This means one million new groups every five years.

　　Why are people afraid of killer bees? People are afraid for two reasons. First, the bees sting(叮) many more times than usual bees. Killer bees can sting sixty times a minute nonstop for two hours. Second, killer bees attack in groups. Four hundred bee stings can kill a person.

　　Already several hundred people are dead. Now killer bees are in Texas. In a few years they will reach all over the United States. People can do nothing but wait.

　　找出主题句后，再依据主题句定短文的中心

　　任意一篇文章通常是围绕一个中心展开并且由段落组成的；段落之间有着内在的紧密联系，而表达段落主题的句子叫主题句，通常置于段落的开头，有时在段落末尾和中间；其它的句子是用来说明和阐述主题句的；若把一个个主题句加以整理，你能悟出其中心思想，同时还可以回避、排除个别生词、难句（等困难信号）所带来的干扰，但也有一些文章的中心思想常贯穿在全文中，因而要综观全文，对全文有一个透彻的理解才行。例如：

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