The very nature of attention exchange is being rapidly transformed, and there is a danger that some of us will develop unhealthy practices. Just as eating red meat every day is a bad idea, so it is with too much attention exchange. The biological consequences of our technological advancement in food production are highly visible; heart disease, diabetes and obesity. The consequences of our transformed attention exchanges will be psychological and social, and so may take longer to identify, but they will be equally damaging.

　　Face-to-face attention is becoming rarer, and therefore more valuable. In a sense it is priceless. And it is a gift that can be given all-year-round.

　　16. In the first two paragraphs the author .

　　A. offers advice to attention givers

　　B. analyses the present problems

　　C. states the necessity of presents

　　D. puts forward his point of view

　　17. Attention exchange was not a major concern in traditional societies because of .

　　A. limited availability of food

　　B. natural checks and balances

　　C. a much smaller population

　　D. the guidance from old people

　　18. What can we infer from Paragraph 6-7?

　　A. More people will risk attention-starvation in future.

　　　B. The nature of attention exchange is rarely changed.

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