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1. Why does the author say that door-knocking has become a lost art?
回答
A. It is not effective； no one will take this method any more.
B. People focus on privacy increasingly, so door-knocking seems like an intrusion into other people.s lives.
回答
A. It is not effective； no one will take this method any more.
B. People focus on privacy increasingly, so door-knocking seems like an intrusion into other people.s lives.
参考答案
