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What is the main idea of this passage?

• A、Polite behaviour varies with different cultures

• B、Less mobile societies have fewer rules.

• C、People from mobile societies are more polite.

• D、Cultural differences are important

What can be learned from Paragraph 1?

• A、People from a mobile society dislike talking about personal affairs

• B、Short-term relationships are common in a mobile society

• C、Americans tend to make more friends than people from other cultures

• D、It is difficult for Americans and Australians to communicate with strangers