单项选择题

Passage Three 
Questions 11 to 15 are based on the following passage. 
Steve and Yaser first met in their chemistry class at an American university. Yaser was an international student from Jordan. He wanted to learn more about American culture. Yaser hoped that he and Steve would become good friends. 
    At first, Steve seemed very friendly. He always greeted Yaser warmly before class. Sometimes he offered to study with Yaser. He even invited Yaser to eat lunch with him. But after the semester was over, Steve seemed more distant. The two former classmates didn't see each other very much at school. One day Yaser was hurt by Steve's change of attitude; he thought they were friends forever." 
Yaser is a little confused. He is an outsider to American culture. He doesn't understand the way Americans view friendship. Americans use the word “friend” in a very general way. They may call both casual acquaintances (相识的人) and close companions "friends". Americans have school friends, work friends, sports friends and neighborhood friends. These friendships are based on common interests. When the shared activity ends, the friendship may fade.  
In some cultures friendship means a strong life-long bond (关系) between two people. In these cultures friendships develop slowly, since they are built to last. American society is one of rapid change. Studies show that one out of five American families moves frequently. Americans develop friendship quickly, and they may change just as quickly. 
    People from the United States may at first seem friendly. Americans often chat easily with strangers. They exchange information about their families, hobbies and work. They may smile warmly and say, "Have a nice day" or "See you later." Schoolmates may say, "Let's get together sometime." But American friendliness is not always an offer of true friendship.

What is the style of American friendship （）

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