单项选择题

You might observe that Americans are always talking. Silence makes most Americans uncomfortable. So they would rather talk about the weather than encounter a lapse(中止)in conversation. Generally speaking Americans are friendly to everyone.
However, don’t mistake friendliness for friendship. Most Americans have many acquaintances(熟人)but few close friends. The people you are friendly with during the first semester(学期)may not necessary stay in touch when classes are over. Each semester brings new acquaintances. Friendships take time to grow. Americans are open and they trust relationships that develop slowly. Young Americans are very friendly and they like to talk to all kinds of people. They smile easily and laugh quite often. But don’t mistake friendliness for physical attraction. Because a person is friendly, he or she is not necessarily interested in dating you. Even if someone accepts a date, it doesn’t mean that the person is ready for an intimate(亲密的)relationship. In short, interpersonal relationships in any culture are difficult and require the use for judgment in every new situation.

When an American smiles to you, it means that（）.

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