Passage One
The humorous story may be told to great length, and may wander around as much as it pleases, and arrive nowhere in particular; but the comic (滑稽的) story and the witty (诙谐的) story must be brief and end with a point. The humorous story continues gently along, the other two burst.
The humorous story is strictly a work of art--high and delicate (精美的) art--and only an artist can tell it; But no art is necessary in telling the comic and witty stories; anybody can do it. The art of telling a humorous story--I mean by word of mouth, not print--was created in America, and has remained at home.
The humorous story is told seriously; the teller does his best to hide the fact that he himself even suspects that there is anything funny about it; but the teller of the comic story tells you beforehand that it is one of the funniest things he has ever heard, then tells it with eager delight, and is the first person to laugh.
When he gets through,
A. laughs at his own joke
B. repeats it several times
C. is very serious when he tells it
D. is concerned about the reaction of his listeners
We can begin our discussion of "population as global issue" with what most persons mean when they discuss "the population problem": too many people on earth and a too rapid increase in the number added each year. The facts are not in dispute, It was quite right to employ the analogy that likened demographic growth to "a long, thin powder fuse that burns steadily and haltingly until it finally reaches the charge and explodes."
To understand the current situation. which is characterized by rapid increases in population, it is necessary to understand the history of population trends. Rapid growth is a comparatively recent phenomenon. Looking back at the 8,000 years of demographic history, we find that populations have been virtually stable or growing very slightly for most of human history. For most of our ancestors. life was hard. often nasty, and very short. There was high fertility in most places, but this was usually balanced by high mortali
A. warn people against the population explosion in the near future
B. compare the demographic growth pattern in the past with that after 1650
C. find out the cause for rapid increase in population in recent years
D. present us a clear and complete picture of the demographic growth
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如果骨髓增生活跃，巨核细胞增多，最有可能的诊断是：（）我来回答:
