考研习题练习
| 考研每日一练（2019/8/2） |
| 第1题：有以下程序main(){int a=0,b=0,c=0,d=0;if(a=1) b=1;c=2;else d=3;printf("%d,%d,%d,%d\n",a,b,c,d);}程序输出( )。
A．0,1,2,0 B．0,0,0,3 C．1,1,2,0 D．编译有错 |
| 【多选题】： |
| 第2题：It is hard to get a grip on fooD、The UN’s World Health Organisation worries about diminishing supplies and increased prices in poor countries; recent riots and near-riots in Haiti,Bangladesh andEgypt were sparked by the growing cost of wheat and rice.But, as Paul Roberts observes in "TheEnd of Food", the developed world has lived through "a near miraculous period during which the things we ate seemed to grow only more plentiful, more secure, more nutritious, and simply better. " 46． In the second half of the 20th century, world output of corn, wheat and cereal crops more than tripleD、Yet there is not enough to feed the rich, the aspirational and the poor in the worlD、A、golden age has been transformed quite suddenly into a global crisis. Mr Roberts insists that modern agribusiness is unsustainable and becoming more so. "Precisely at the moment in history when we need to shift our system of food production into overdrive, our agricultural engine is breaking down," he says. The industry has taken cheap oil for granteD、Oil fuels transportation and farm machinery, and natural gas is the basis of synthetic nitrogen production ( prices have tripled since 2002).Agriculture accounts for three- quarters of freshwater use, and water is becoming an increasingly scarce and expensive resource.Climate change makes some old assumptions about farming redundant. 47．A、combination of these factors, he says, will ultimately force a complete rethinking of the way we make fooD、 For years government subsidies held down grain prices, making food cheaper. 48．Water was also plentiful-it takes 1,000 tonnes of water to produce a tonne of grain-and an ingenious process known as Haber-Bosch makes synthetic nitrogen fertiliser easily available to grain farmers. Ruthless price-cutting at supermarkets means consumers have grown accustomed to eating too much. (In the late 19th century,Europeans already thoughtAmericans ate three or four times more than was necessary. ) The most damaging consequence is that by 2000 31% ofAmerican adults were obese, with another 16% defined as overweight.American airlines spend $ 275 million a year more on fuel simply to lift the heavier passengers. Mr Roberts claims that every year obesity causes 400,000 premature deaths inAmericA、Food has become as deadly as tobacco. A、fruitful start would be to halve the size of portions in allAmerican restaurants, but most consumers are reluctant rethinkers. 49．Eating organic product could be a partial solution, although one study suggests that the cost of avoiding intensive farm chemicals would mean a 31% increase in food prices. Government scientists believe that genetically modified crops might be the only way out of the crisis, but a majority of consumers are reluctant to listen. Is there a model for the future 50．Fashionably, Mr. Roberts believes that a local system based on easily obtainable seasonal foods that do not need to be transported huge distances would form part of a solution. The economics and greenery of this are far from proven. Mr Roberts can find only one country that has made "serious efforts" in this direction:Cuba, hardly a comforting example. The coming food crisis, warns the author, is as intractable as global warming, and no less urgent. |
| 【分析题】： |
| 第3题： A．Moreover B．Though C．Therefore D．Otherwise |
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| 第4题：It is widely known that birds learn to fly through practice, gradually (1) their innate ability into a finely tuned skill. (2) , a recent study conducted by the University of Sheffield’sDepartment of Psychology has discovered that the reason birds learn to fly so easily is because memories may have been left behind by their ancestors. These skills may be easy to enhance because of a (3) specified latent (4) for flying. The researchers used simple models of brains called (5) neural networks and computer (6) to test his theory. They discovered that learning in (7) generations (8) induces the formation of a latent memory in the current generation and (9) decreases the amount of learning requireD、These effects are especially pronounced if there is a large biological "fitness cost" to learning, where biological fitness is measured in terms of the number of (10) each individual has. The beneficial effects of learning also (11) the unusual form of information storage in neural networks. (12) computers, which store each item of information in a specific location in the computer’s memory chip, neural networks store each item (13) over many neuronal connections. (14) information is stored in this way then (15) is accelerated, explaining how complex motor skills, such as nest building and hunting skills, are (16) by a combination of innate ability and learning over many generations. The researchers concluded that this new theory has its (17) in ideas (18) by JamesBaldwin in 1896, who firstly made the counter-intuitive argument that learning within each generation could guide evolution of innate behavior over future generations.Baldwin was right, (19) in ways less sophisticated than he could have imagined because concepts (20) artificial neural networks and distributed representations were not known in his time. A、as for B、in particularC、such asD、for instance |
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| 第5题：当国民收入在乘数和加速数的作用下趋于下降时，其减少将受到下述哪项因素而放慢 ( ) A．失业增加 B．边际消费倾向下降 C．加速系数上升 D．总投资降为零 |
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第6题：设
 ，则F(x)等于() |
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| 第7题： 我国的乳腺癌临床分期标准认为Ⅰ期乳腺癌肿块大小不超过 A．1cm B．2cm C．6cm D．4cm |
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| 第8题： 直肠癌切除术能否保留肛门，主要取决于 A．肿瘤距肛门的距离 B．肿瘤是否已侵犯肠管周围组织 C．肿瘤的病理类型 D．肿瘤是否有远处转移 |
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| 第9题：古罗马帝国时期，主要培养()
A．农夫和军人 B．官吏和顺民 C．演说家与政治家 D．哲学家和武士 |
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| 第10题：5月9日，俄罗斯纪念卫国战争胜利庆典在莫斯科隆重举行。国家主席胡锦涛和来自世界20多个国家的领导人出席庆典，纪念卫国战争胜利()
A．60周年 B．70周年 C．55周年 D．65周年 |
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