We can see how the product life cycle works by looking at the introduction of instant coffee. When it was introduced, most people did not like it as much as "regular" coffee and it took several years to gain general acceptance (introduction stage). At one point, though, instant coffee grew rapidly in popularity and many brands were introduced (stage of rapid growth). After a while people became attached to one brand and sales leveled off (stage of maturity). Sales went into a slight decline when freeze-dried coffees were introduced (stage of decline).
　　The importance of the product life cycle to marketers is this: different stages in the product life cycle call for different strategies. The goal is to extend product life so that sales and profits do not decline. One strategy is called market modification. It means that marketing managers look for new users and market sections. Do you know, for example, that the backpacks that so many students carry today were originally designed for the military?
　　Market modification also means searching for increased usage among present customers or going for a different market, such as senior citizens. A marketer may re-position the product to appeal to new market sections.
　　Another product extension strategy is called product modification. It involves changing product quality, features, or style to attract new users or more usage from present users. American auto manufacturers are using quality improvement as one way to recapture（夺回） world markets. Note, also, how auto manufacturers once changed styles dramatically from year to year to keep demand from falling.
46. According to the passage, when people grow accustomed to one particular brand of a product, its            sales will ______.                       
A. decrease gradually                                 B. become unstable
C. improve enormously                            D. remain at the same level
47. The first paragraph tells us that a new product is _____ .
　A. usually introduced to satisfy different tastes
　B. often more expensive than old ones
　C. often inferior to old ones at first
　D. not easily accepted by the public
48. Marketers need to know which of the four stages a product is in so as to _____ .
　A. work out marketing policies                   B. promote its production
　 C. increase its popularity                                      D. speed up its life cycle
49. The author mentions the example of "backpacks"(Line 4, Para.2 ) to show the importance of             _______ .
　 A. increasing usage among students       B. pleasing the young as well as the old
　 C. exploring new market sections             D. serving both military and civil needs
50. In order to recover their share of the world market, U.S. auto makers are _______ .
　 A. improving product feature                     B. making their products better
C. modernizing product style                    D. increasing product quantity

　　　 Shakespeare, more perhaps than any other writer, made full use of the greatest resources of the English Language．Most of us use about five thousand words in our normal employment of English; Shakespeare in his works used about twenty-five thousand! There is probably no better way for a foreigner to appreciate the richness and variety of the English language than by studying the various ways in which Shakespeare uses it．Such a study is well worth the effort, even though some aspects of English usage, and the meaning of many words, have changed since Shakespeare’s day．

　　　 However, it is surprising that we should know comparatively little about the life of the greatest English author．We know that Shakespeare was born in 1564 in Stratford-on-Avon, and that he died there in 1616．He almost certainly attended the Grammar School in the town, but of this we cannot be sure．We know he was married there in 1582 to Anne Hathaway and that he had three children．We know that he spent much of his life in London writing his masterpieces．But this is almost all that we do know．

　　　 However, what is important about Shakespeare’s life is not its incidental details but its products, the plays and the poems．For many years scholars have been trying to add a few facts about Shakespeare’s life to the small number we already possess and for an equally long time critics have been theorizing about the plays．Sometimes, indeed, it seems that the poetry of Shakespeare will disappear under the great mass of comment that has been written upon it．

　　　 Fortunately this is not likely to happen．Shakespeare’s people have long delighted not just the English but lovers of literature everywhere, and will continue to do so after the scholars and critics and all their works have been forgotten．

55. This passage is about 　　　　．

　　　 A. the great length of each chapter

　　　 B. the great varieties in writing styles

　　　 C. the richness of the content in Shakespeare’s works

　　　 D. the rich English language used by Shakespeare in his works

56. According to the writer, which of the following remains uncertain about Shakespeare?

　　　 A. His date of birth．　　　　　　　 　　　　　

B. His marriage．

　　　 C. His life in the Grammar School．　 　　　　

D. His date of death．

57. It can be inferred from Para 3 that 　　　　　．

　　　 A. not all the comments on Shakespeare’s works have produced good effects

　　　 B. scholars have successfully collected facts about Shakespeare’s life

　　　 C. critics are more interested in Shakespeare’s play than his poetry

　　　 D. the details of Shakespeare’s life are more important than his literary works

58. What does the last sentence in Para 3 mean ?

　　　 A. People don’t think the poetry of Shakespeare good any more．

　　　 B. People pay more attention to the comment than the poetry of Shakespeare．

　　　 C. People can’t see the poetry of Shakespeare any more．

　　　 D. The comment is printed on the poetry of Shakespeare．