But people say one thing and do another.Only a small part of Americans change any behavior in an effort to preserve their privacy.Few people turn down a discount at tollbooths(收费亭)to avoid using the EZ－Pass system that contracts(跟踪) automobile movements.And few turn down supermarket loyalty cards.Privacy economist Alessandro Acquits has run a series of tests that reveal people will submit personal information like Social Security numbers just to get their hands on a pitiful 50－cent－off 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.

　　28．From Paragraph 2，we can infer________.

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

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

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

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

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

　　A．There should be a distance even between friends.

　　B．There should be fewer quarrels between friends.

　　C．Friends should always be faithful to each other.

　　D．Friends should open their hearts to each other.

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