99 年改错The hunter-gatherer tribes that today live as our prehistoric 1._human ancestors consume primarily a vegetable diet supplementing 2._with animal foods. An analysis of 58 societies of modem hunter- gatherers, including the Kung of southern Africa, revealed that one half emphasize gathering plant foods, one-third concentrate on fishingand only one-sixth are primarily hunters. Overall, two-thirdsand more of the hunter-gatherers calories come from plants. Detailed 3._studies of the Kung by the food scientists at the University ofLondon, showed that gathering is a more productive source of foodthan is hunting. An hour of hunting yields in average about 100 4._edible calories, as an hour of gathering produces 240. 5._ Plant foods provide for 60 percent to 80 percent of the Kung 6._diet, and no one goes hungry when the hunt fails. Interestingly, ifthey escape fatal infections or accidents, these contemporaryaborigines live to old ages despite of the absence of medical care. 7._They experience no obesity, no middle-aged spread, little dental decay, no high blood pressure, on heart disease, and their bloodcholesterol levels are very low( about half of the average American 8._adult), if no one is suggesting what we return to an aboriginal life 9._style, we certainly could use their eating habits as a model for 10._healthier diet.1999 年1. 答案：as like2. 答案：supplementing supplemented3. 答案：and or4. 答案：in on5. 答案：as while / whereas 6. 答案：删去 for，或改成 about7. 答案：删去第一个 of8. 答案：half that9. 答案：if While / Although / Though10. 答案：for a2000 改错The grammatical words which play so large a part in English grammar are for the most part sharply and obviously different 1._ from the lexical words. A rough and ready difference which may seem the most obvious is that grammatical words have“ less meaning”, but in fact some grammarians have called them 2._ “empty” words as opposed in the “full” words of vocabulary. 3._ But this is a rather misled way of expressing the distinction. 4._ Although a word like the is not the name of something as man is, it is very far away from being meaningless; there is a sharp 5._ difference in meaning between “man is vile and” “the man is vile”, yet the is the single vehicle of this difference in meaning. 6._ Moreover, grammatical words differ considerably among themselves as the amount of meaning they have, even in the 7._ lexical sense. Another name for the grammatical words has been “little words”. But size is by no mean a good criterion for 8._ distinguishing the grammatical words of English, when we consider that we have lexical words as go, man, say, car. Apart 9._ from this, however, there is a good deal of truth in what some people say: we certainly do create a great number of obscurity 10._ when we omit them. This is illustrated not only in the poetry of Robert Browning but in the prose of telegrams and newspaper headlines.2000 年1. 答案：删去 the2. 答案：but and/thus3. 答案：in to4. 答案：misled misleading5. 答案：删去 away6. 答案：single only7. 答案：as in8. 答案：mean means9. 答案： lexical such 或在 words 后加 such，或把改成 like10. 答案：number deal / amount2001 改错During the early years of this century, wheat was seen as the very lifeblood of Western Canada. People on city streets watched the yields and the price of wheat in almost as much feeling as if 1._ they were growers. The marketing of wheat became an increasing 2._ favorite topic of conversation. War set the stage for the most dramatic events in marketing the western crop. For years, farmers mistrusted speculative grain selling as carried on through the Winnipeg Grain Exchange. Wheat prices were generally low in the autumn, so farmers could 3._ not wait for markets to improve. It had happened too often that they sold their wheat soon shortly after harvest when farm debts 4._ were coming due, just to see prices rising and speculators getting rich. 5._ On various occasions, producer groups, asked firmer control, 6._ but the government had no wish to become involving, at 7._ least not until wartime when wheat prices threatened to run wild. Anxious to check inflation and rising life costs, the federal 8._ government appointed a board of grain supervisors to deal with deliveries from the crops of 1917 and 1918. Grain Exchange trading was suspended, and farmers sold at prices fixed by the board. To handle with the crop of 1919, the government appointed 9._ the first Canadian Wheat Board, with total authority to 10._ buy, sell, and set prices.2001 年1. 答案：in with2. 答案：increasing increasingly3. 答案：so but4. 答案：删去 soon 或 shortly5. 答案：just only6. 答案：asked for7. 答案：involving involved8. 答案：life living9. 答案：handle deal 或 删去 with10. 答案：total full/complete/absolute2002