问答题Practice 2 Today monocultures have increased dramatically worldwide, mainly through the geographical expansion of land devoted to single crops and year-to-year production of the same crop species on the same land. Available data indicate that the amount of crop diversity per unit of arable land has decreased and that croplands have shown a tendency toward concentration. There are political and economic forces influencing the trend to devote large areas to monoculture, and in fact such systems are rewarded by economies of scale and contribute significantly to the ability of national agricultures to serve international markets. The technologies allowing the shift toward monoculture were mechanization, the improvement of crop varieties, and the development of agrochemicals to fertilize crops and control weeds and pests. Government commodity policies these past several decades encouraged the acceptance and utilization of these technologies. As a result, farms today are fewer, larger, more specialized and more capital-intensive. At the regional level, increases in monoculture farming meant that the whole agricultural support infrastructure (i.e. research, extension, suppliers, storage, transport, markets, etc.) has become more specialized.
问答题
Practice 2 Today monocultures have increased dramatically worldwide, mainly through the geographical expansion of land devoted to single crops and year-to-year production of the same crop species on the same land. Available data indicate that the amount of crop diversity per unit of arable land has decreased and that croplands have shown a tendency toward concentration. There are political and economic forces influencing the trend to devote large areas to monoculture, and in fact such systems are rewarded by economies of scale and contribute significantly to the ability of national agricultures to serve international markets. The technologies allowing the shift toward monoculture were mechanization, the improvement of crop varieties, and the development of agrochemicals to fertilize crops and control weeds and pests. Government commodity policies these past several decades encouraged the acceptance and utilization of these technologies. As a result, farms today are fewer, larger, more specialized and more capital-intensive. At the regional level, increases in monoculture farming meant that the whole agricultural support infrastructure (i.e. research, extension, suppliers, storage, transport, markets, etc.) has become more specialized.
参考解析
解析：
暂无解析
相关考题：
Why do experts say twins are more alike than clones would be?A、They have at least shared the same environment within the mother.B、They have the same genes.C、They are usually raised in the same family.D、They have the same interests.
As a result of destroying the forest, a large ( )of desert( )covered the land. A、number/ haveB、quantity/ hasC、number/ hasD、quantity/ have
阅读以下说明和C++程序，将应填入(n)处的字句写在对应栏内。[说明]下面程序输出一个矩形面积，以及矩形区域上的假想的作物产量。[C++程序]include ＜iostream.h＞class crop_assessment{int actual_crop;int ideal_crop;public:void set(int in_actual,int in_ideal){actual crop=in_actual;ideal_crop=in_ideal;}int get_actual_crop(void){ (1) ;}int get_ideal_crop(void){ (2) ;)};Class lot_size{int length;int width;(3) crop;public:void set(int 1,int w,int a,int i){length=1;width=w;crop.set(a,i);}int get_area(void){return length*width;}int get_data(void){return (4) ;}int get_data2(void)freturn (5) ;}}int main(){Los_size small，medium;small.set(5,5,5,25);medium.set(10,10,10,50);cout＜＜"For a small lot of area"＜＜smallget_area()＜＜“\n”;cout＜＜"the actual crops are$"＜＜small.get_data2()＜＜"\n";cout＜＜"and ideal crops are$”＜＜small.get_data()＜＜"\n";cout＜＜"For a medium Lot of area"＜＜medium.get area()＜＜:\n”;cout＜＜"the actual crops are$"＜＜medium.get_data2()＜＜"\n";cout＜＜"and ideal crops are$"＜＜medium.get_data()＜＜"\n";return 0;}
Rapid advances in computer and communication technologies have resulted in the(71) merger of these two fields. The lines have bluned among computing, switching, and digital transmission equipment, and the same digital techniques are being used for data, voice, and image transmission. Merging and evolving technologies, coupled with increasing demands for efficient and timely collection, processing, and(72) of information, are leading to the development of(73) that transmit and process all types of data. The ultimate goal of this evolution is something its proponents-some of the most powerful forces in the computing and telecommunications industries-call the (74) .The (74) will be a worldwide public telecommunications network that will deliver a wide variety of services. The (74) will be defined by the standardization of user interfaces, and will be implemented as a set of digital switches and paths supporting a broad range of traffic types and providing (75) processing services. Inpractice, there will be multiple networks, implemented within national boundaries, but from the user's point of view there will be a single, uniformly accessible worldwide network.A．decreasingB．increasingC．collectiveD．single
When designing an expansion within the same data center, when is a pre－sales TDA absolutely required by IBM?() A. for a SAN768B DirectorB. for a second TS3500 Tape LibraryC. for a second EXP5060 Expansion UnitD. for an additional DS8300 Expansion Frame
A customer has a Fibre Channel switch residing in a configuration where both production and test data coexist. Which of the following is the simplest method for ensuring that the two types of data do not flow through the same port?（）A.VLANB.zoningC.trunkingD.LUN masking
In which three cases would you use the USING clause?() A.You want to create a nonequijoin.B.The tables to be joined have multiple NULL columns.C.The tables to be joined have columns of the same name and different data types.D.The tables to be joined have columns with the same name and compatible data types.E.You want to use a NATURAL join, but you want to restrict the number of columns in the join condition.
阅读以下说明和Java程序，将应填入(n)处的字句写在对应栏内。[说明]下面程序输出一个矩形面积，以及矩形区域上的假想的作物产量。[Java程序]public class MainJava {public static void main(String[] args){Lot_size small=new Lot_size();Lot_size medium=new Lot_size();small.set(5,5,5，25);medium.set(10,10,10,50);System.out.println("For a small lot of area"+small.get_area()+"\n");System.out.println("the actual crops are $"+small.get_data2()+"\n");System.out.println("and ideal crops are $"+small.get data()+"\n");System.out.println("For a medium lot of area"+medium.get_area()+“\n”)；System.out.println("the actual crops are $"+medium.get_data2()+"\n");System.out.println ("and ideal crops are $"+medium.get_data()+"\n");}}class Crop_assessment{private int actual_crop;private int ideal_crop;public void set(int in_actual,int in ideal){actual_crop=in_actual;ideal_crop=in_ideal;}public int get_actual_crop(){return (1) ;}public int get_ideal_crop()(return (2) ;}}class Lot_size{private int length;private int width;private Crop_assessment crop= (3) ;public void set(int 1,int W,int a,int i){length=1;width=W;crop.set(a,i);}public int get_area(){return length*width;}public int get_data()freturn (4) ;}public int get_data2()(return (5) ;}}
In practice, it is usual for ship to be loaded _____ to improve the vessel’s movement through the water.A.a little deeper aftB.a little deeper forwardC.at the same draught between fore and aftD.a balance between two sides
In which stage of the Presentation-Practice-Production approach will students have the chance to use the new language freely and incorporate it into their existing language?A.Presentation stageB.Practice stageC.Production stageD.Practice stage and Production stage
In which stage of the Presentation-Practice-Production approach will students have the chance to use the new language freely and incorporate it into their existing language?A.Presentation stage B.Practice stageC.Production stageD.Practice stage and Production stage
共用题干Genetically Modified FoodEver since they were first put on the market in the early 1990s,genetically modified(GM，转基因）foods have been increasingly developed and marketed in many countries in the world, mainly on the basis of their promise to end the worldwide food crisis.______(46)Even if it would,is it the best solution?Despite what it promises,GM technology actually has not increased the production potential （潜力）of any crop.______(47)For instance,a report that analyses nearly two decades of research on major GM food shows that GM engineering has failed to significantly increase US crop production.______(48)While GM seeds are expensive,GM companies tell farmers that they will make good profits by saving money on pesticides（杀虫剂）.On the contrary, US government data show that GM crops in the US have produced an overall increase in pesticide use compared to traditional crops."The promise was that you could use less chemicals and boost production.But neither is true,"said Bill Christison,President of the US National Family Farm Coalition.At the same time,the authors of the book World Hunger:Twelve Myths argue that there actually is more than enough food in the world and that the hunger crisis is not caused by production. ______(49)These indeed deserve our efforts and money. Meanwhile,the rise in food prices results from the increased use of crops for fuel rather than food shortage,according to a 2008 World Bank report.______(50)Another World Bank report concluded that GM crops have little to offer to the challenges of worldwide poverty and hunger,because better ways out are available,among which "green"farming is supposed to be the first choice._______（49）A:Problems come from food distribution and politics.B:But can GM technology solve world hunger problems?C:In fact,studies show that the most widely grown GM crop has suffered reduced productivity.D:As a matter of fact,scientists see better ways to feed the world.E:Something else,however,has been on the rise.F: GM has many benefits when it was used at the beginning.
Linguistic forms having the same sense may have different references in different situations while linguistic forms with the same reference always have the same sense.
Which two statements are true regarding the USING clause in table joins?（）A、It can be used to join a maximum of three tables B、It can be used to restrict the number of columns used in a NATURAL join C、It can be used to access data from tables through equijoins as well as nonequijoins D、It can be used to join tables that have columns with the same name and compatible data types
A customer has a Fibre Channel switch residing in a configuration where both production and test data coexist. Which of the following is the simplest method for ensuring that the two types of data do not flow through the same port?（）A、VLANB、zoningC、trunkingD、LUN masking
A customer has 4 EXP5000 expansion enclosures attached to an IBM System Storage DS5100 intheir production environment， and the same configuration in their disaster recovery environment.The customer removes the drives from the production environment and ships them to the disasterrecovery facility. What IBM technology feature gives the customer the ability to migrate drives fromone DS5000 to another DS5000 with data intact？（）A、SnapCopyB、DACstoreC、FlexCloneD、RAID Protect
Attaching to a NAS storage system through redundant NICs will provide which of the following？（）A、High availability and failoverB、File sharing on the storage systemC、Better bandwidth through NIC Teaming on attached serversD、Greater number of LUNS available on the same storage system
A technician notices the storage space available on a data server is rapidly decreasing. A few users seem to be storing considerably more data than the other users. Which of the following should the technician implement to give all users the same amount of available storage space？（）A、Disk quotasB、Group membershipsC、Logon scriptsD、Shadow volumes
LPAR1 is configured to have the same 2 LUNs virtualized by a redundant pair of VIO servers. Which command will validate that both storage paths are available？（）A、LspathB、sdd query adapterC、pcmpath query adapterD、datapath query device
When designing an expansion within the same data center, when is a pre-sales TDA absolutely required by IBM?（）A、for a SAN768B DirectorB、for a second TS3500 Tape LibraryC、for a second EXP5060 Expansion UnitD、for an additional DS8300 Expansion Frame
A machine’s ONLY external interface is configured with an address of 192.168.5.1 and a netmask of 255.255.255.0. No slots are available for expansion. Which of the following procedures should be performed to make it function as a gateway？（）A、Enable ipforwarding onlyB、Configure an alias on the same interface and enable ipforwardingC、Add a second interface into the same subnet and enable ipforwardingD、Add a second interface into a different subnet， and enable ipforwarding
Which two statements are true regarding the usage of the SQL*Loader utility（）A、You can load data into multiple tables during the same load session.B、You can load data from multiple files to a table during the same load session.C、You cannot perform selective data loading based on the values available in the records.D、You can use an export file generated by the EXPDP utility as an input data file to load the data.E、You can load data only if the input file is available on the disk and tape but not in a named pipes.
多选题Which two statements are true regarding the USING clause in table joins?（）AIt can be used to join a maximum of three tablesBIt can be used to restrict the number of columns used in a NATURAL joinCIt can be used to access data from tables through equijoins as well as nonequijoinsDIt can be used to join tables that have columns with the same name and compatible data types
问答题Practice 1 The agricultural sciences deal with the challenges of food and fiber production and processing. They include the technologies of soil cultivation, crop cultivation and harvesting, animal husbandry and the processing of plant and animal products for human consumption and use. As a result of the doubled yields of some economic crops, the farm output per hour of farm work increased almost 10-fold as capital was substituted for labor. New techniques of preserving food products made possible transportation over greater distances, in turn facilitating adjustments among locations of production and consumption, with further benefits to production efficiency.
单选题Which statement most accurately describes the difference between the two passages?APassage 1 deals less directly with the exportation of chimpanzees than does Passage 2.BPassage 1 is less concerned with the interaction between man and the land than is Passage 2.CPassage I pertains to a species in its indigenous habitat while Passage 2 addresses the same animal in nonnative settings.DPassage I ends with an expression of optimism and Passage 2 does not.EPassage I introduces a species and describes its status worldwide, while Passage 2 limits its discussion of that species to its activities in the Northern Hemisphere.
问答题Practice 1 There is no great difference between city, suburb and village schools in the United States. Public schools teach the same subjects in the same grades across the land. Most school buildings look the same and have the same types of rooms inside. There is always a gym, a large room for basketball and other sports. There is a lunchroom, a school library, and an auditorium, a very large room where all the students and teachers can meet. Most schools also have rooms for the school band to practice in. They have rooms for students to type and use computers. There are usually workshops for students to work with paint, wood, metal, and other materials. These are all part of most American public schools, no matter where they are. Each school serves a neighborhood, and neighborhoods are different. In some, the parents take an interest in what their children are doing at school. They give their time, their ideas, and they may give gifts to their schools. That's what makes a good school in America. Generally, it doesn't matter whether the neighborhood is rich or poor, whether it is in the city, the suburbs, or the countryside. What matters is the interest the neighborhood takes in its school.