1 Fei, Meilan, and Lihua Lin are si

1 Fei, Meilan, and Lihua Lin are sisters. They live in the same city, and they are studying to be doctors at the same university. But they are very different in their behavior and personality.
2 Fei is friendly and outgoing; she like to be around other people. Fei is rebellious. She doesn’t like to follw rules, and she likes to do things her own way. She is very active, and she enjoys going to restaurants, parties, and music concerts.
3 Meilan is a happy person, but, unlike Fei, she prefers to be alone. She has two good friends whom she sees two or three times a month likes structure, and she doesn’t like change. She is happiest when she stays at home and reads a book or watches a movie.
4 Lihua is quiet and reserved. She doesn’t smile or laugh very often. Some people who don’t know her very well think she is unfriendly. But her best friend says she can depend on Lihua and that other people just don’t understand her.
5 What makes their personalities so different? There are many theories about where personality and dehavior come from.
6 Most scientists agree that our personalities are influenced by both our genes and our environment. However, there is much debate about which of these is the most important. Some scientists believe that a person’s personality is mainly inherited. The idea is that genes from our parents make us the way we are. This suggests that our personality is decided by nature, so we cannot easily change it. Others say that our environment is the most important influence on our personality and behavior. As we grow up, our personalities are influenced by our surroundings and the way our parents raise us. This is often called the “nurture” theory.
7 There are many other popular theories about what makes us the way we are. One of these is that personality is defined by blood type-A,B,O or AB People with type A blood like to follow rules. People with type O blood are the opposite-they dislike rules and structure.
8 Fei,Meilan, and Lihua don’t know what makes each of them the way they are. Perhaps the most important thing is that they get along with each other despite their differences.