Directions: In this section, you will hear a passage three times． When the passage is read for the firsttime, you should listen carefully for its general idea．When the passage is read ．for thesecond time, you are required to fill in the blanks with the exact words you have justheard． Finally, when the passage is read for the third time, you should check what youhave written．
　　听录音,回答27-36题
　　Many college students today own personal computers that cost anywhere from $1,000 to perhaps$5,000 or more．(26)  , it is not uncommon for them to purehase (27) costing another several hundred dollars． Twenty years ago, computers were (28), butthey were very large and extremely expensive． Few, if any, (29)   purchased computersfor home use． Over the years, the price of the"guts" of a computerits memoryhas declined to lessthan a thousandth of the price per unit of memory that prevailed twenty yeats ago． This is the mainreason why computers cost so much less today than they used to． Moreover, (30)  improvements have made it possible to (31)  memory circuitry that is small enough to fitinto the portable personal computers that many of us own and use． (32), as the priceof computation has declined the average consumer and business have spent more on purchasingcomputers．(33)       , improved agricultural technology, hybrid seeds, (34) animal breeding, and so on have vastly increased the amount of output a typical farmer can produce．The prices of goods such as meats and grains have fallen sharply relative to the prices of most othergoods and services． As agricultural, prices have "fallen, many households have decreased their totalexpenses on food． Even though the (35) of a product purchased generally increaseswhen its price falls, total expenses on it may decline．

27、第(26)题__________
28、第(27)题__________
29、第(28)题__________
30、第(29)题__________
31、第(30)题__________
32、第(31)题__________
33、第(32)题__________
34、第(33)题__________
35、第(34)题__________
36、第(35)题__________

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