B. the idea of living beyond the present life span

　　C. the idea of living from 200 to 300 years

　　D. the conservative estimate

　　答案: B指导：全文谈的都是人的寿命能否超越现在的期限，故选B.

　　4. What would be the best tide for this text?

　　A. Living Longer or Not

　　B. Science, Technology and Long Living

　　C. No Limit for Human Life

　　D. Healthy Lifestyle and Long Living

　　答案: A

　　指导：参考上题指导。

　　K

　　Who is there among us who hasn't dreamed of having his or her own small ( maybe, several years later, even big) business, and having wonderful freedom, both from a boss and from the time clock: the freedom to make up our own rules for our work, and our own plans--arranging our own hours of work? That way work would be both painless and fun. Or, so we imagine.

　　Well, in fact it isn't quite as simple as that. Yes, it is true that being the boss has its satisfactions and that you can arrange your working hours freely if you own your own small business. But in those early years of starting your own business, you shouldn't think of a free day, not to mention flying off for a month's vacation. It is not unusual for new business owners to work seventy or eighty hours a week, and if there is a day off, that day might need to be devoted to accounting(算账).

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