But people say one thing and do another. Only a tiny fraction(部分) of Americans change any behaviors in an effort to preserve their privacy. Few people turn down a discount at tollbooths(收费站) to avoid using the EZ-Pass system that can track automobile movements. And few turn down supermarket loyalty cards. Privacy economist Alessandro Acquisti has run a series of tests that reveal people will surrender personal information like Social Security numbers just to get their hands on a pitiful 50-cent-of coupon(优惠券).

　　But privacy does matter — at least sometimes. It’s like health: when you have it, you don’t notice it. Only when it’s gone do you wish you’d done more to protect it.

　　13. By saying “the 21st century equivalent of being caught naked”, the author means ______.

　　A. people’s personal information is easily accessed without their knowledge

　　B. in the 21st century people try every means to look into others’ secrets

　　C. people tend to be more frank with each other in the information age

　　D. criminals are easily caught on the spot with advanced technology

　　14. What would psychologists advise on the relationships between friends?

　　A. Friends should open their hearts to each other.

　　B. Friends should always be faithful to each other.

　　C. There should be a distance even between friends.

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