【答案解析】The perception that one must know his neighbors has died out in the populous city, but it still exists in small towns and rural areas.
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【答案解析】The biggest mistake human beings make is they think that social and political issues are so easy that there is no need to take scientific ways to deal with the issues; they can be judged and solved by practical experience, but the fact is quite the opposite.
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【答案解析】Only by enjoying what you have, doing what you should do and not making comparison with the imagined—maybe completely wrong—luckier ones, can you really get rid of envy.