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单选题
It is that reduce the BOD by converting the organic content of the sewage to a chemically and organically inert sludge（）
A
the bacteria
B
oxygen
C
oxidizing function
D
agitation function
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Organic Food:Why?1 Europe is now the biggest market for organic food in the world,expanding by 25 percent a year over the past 10 years.So what is the attraction of organic food for some people?The really important thing is that organic sounds more"natural".Eating organic is a way of defining oneself as natural,good,caring, different from the junk-food-eating masses.2 Unlike conventional farming,the organic approach means farming with natural,rather than man- made , fertilisers and pesticides. Techniques such as crop rotation（轮种）improve soil quality and helporganic farmers compensate for the absence of man-made chemicals.As a method of food production,organic is,however,inefficient in its use of labour and land;there are severe limits to how much food can be pro- duced.Also,the environmental benefits of not using artificial fertilisers are tiny compared with the amount of carbon dioxide emitted（排放）by transporting food.3 Organic farming is often claimed to be safer than conventional farming. Yet studies into organic farming worldwide continue to reject this claim.An extensive review by the UK Food Standards Agency foundthat there was no statistically significant difference between organic and conventional crops.Even where re-sults indicated there was evidence of a difference,the reviewers found no sign that these differences would have any noticeable effect on health.4 The simplistic claim that organic food is more nutritious than conventional food was always likely to be misleading. Food is a natural product,and the health value of different foods will vary for a number of rea-sons,including freshness,the way the food is cooked,the type of soil it is grown in,the amount of sunlight and rain crops have received,and so on.Likewise,the flavour of a carrot has less to do with whether it was fertilised with manure（粪便）or something out of a plastic sack than with the variety of carrot and how long ago it was dug up.5 The notion that organic food is safer than"normal"food is also contradicted by the fact that many of our most common foods are full of natural toxins（毒素）.As one research expert says : " People think that the more natural something is,the better it is for them.That is simply not the case.In fact,it is the opposite that is true:the closer a plant is to its natural state,the more likely it is that it will poison you.Naturally, many plants do not want to be eaten,so we have spent 10,000 years developing agriculture and breeding out harmful traits from crops."Paragraph 4________A:Factors That Affect Food Health ValueB:Main Reason for the Popularity of Organic FoodC:Testing the Taste of Organic FoodD:Research Into Whether Organic Food Is Better E:Necessity to Remove Hidden Dangers From FoodF:Description of Organic Farming
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Organic Food:Why?1 Europe is now the biggest market for organic food in the world,expanding by 25 percent a year over the past 10 years.So what is the attraction of organic food for some people?The really important thing is that organic sounds more"natural".Eating organic is a way of defining oneself as natural,good,caring, different from the junk-food-eating masses.2 Unlike conventional farming,the organic approach means farming with natural,rather than man- made , fertilisers and pesticides. Techniques such as crop rotation（轮种）improve soil quality and help organic farmers compensate for the absence of man-made chemicals.As a method of food production,organic is,however,inefficient in its use of labour and land;there are severe limits to how much food can be pro- duced.Also,the environmental benefits of not using artificial fertilisers are tiny compared with the amount of carbon dioxide emitted（排放）by transporting food.3 Organic farming is often claimed to be safer than conventional farming. Yet studies into organic farming worldwide continue to reject this claim.An extensive review by the UK Food Standards Agency found that there was no statistically significant difference between organic and conventional crops.Even where re- sults indicated there was evidence of a difference,the reviewers found no sign that these differences wouldhave any noticeable effect on health.4 The simplistic claim that organic food is more nutritious than conventional food was always likely to be misleading. Food is a natural product,and the health value of different foods will vary for a number of rea- sons,including freshness,the way the food is cooked,the type of soil it is grown in,the amount of sunlight and rain crops have received,and so'on.Likewise,the flavour of a carrot has less to do with whether it was fertilised with manure（粪便）or something out of a plastic sack than with the variety of carrot and how long ago it was dug up.5 The notion that organic food is safer than"normal"food is also contradicted by the fact that many of our most common foods are full of natural toxins（毒素）.As one research expert says: "People think that the more natural something is,the better it is for them.That is simply not the case.In fact,it is the opposite that is true:the closer a plant is to its natural state,the more likely it is that it will poison you.Naturally, many plants do not want to be eaten,so we have spent 10,000 years developing agriculture and breeding out harmful traits from crops."Paragraph 1_______A:Factors That Affect Food Health ValueB:Main Reason for the Popularity of Organic FoodC:Testing the Taste of Organic FoodD:Research Into Whether Organic Food is BetterE:Necessity to Remove Hidden Dangers From FoodF:Description of Organic Farming
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Which content network component is primarily used to store and deliver content from the network edge?（）A、Content switchB、Content routerC、Content engineD、Content Distribution Manager (CDM)
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Which content network component is primarily used to store and deliver content from the network edge?（）A、Content routerB、Content switchC、Content Distribution Manager (CDM)D、Content engine
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A network administrator has been receiving work orders about poor voice quality crossing a branch T1. The cause is determined to be users running high bandwidth file sharing applications across the T1 sending large packets delaying the smaller voice streams. Which of the following would improve voice quality?（）A、Configure traffic shaping to reduce the bandwidth available to the file sharing application.B、Configure a separate VLAN for the IP phones.C、Install a content caching proxy at the branch to reduce inbound WAN traffic.D、Upgrade switches to provide higher bandwidth ports for workstations and IP phones.
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Company.com is considering converting from IPAT via replacement to IPAT via IP aliasing. What condition of IPAT via IP aliasing must be taken into consideration？（）A、 The clients must support gratuitous ARP.B、 The network type must support gratuitous ARP.C、 Additional TCP/IP interfaces must be allocated for backup in case of failure.D、 Using IPAT via IP aliasing will reduce the number of rotating resource groups that can be used.
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单选题Company.com is considering converting from IPAT via replacement to IPAT via IP aliasing. What condition of IPAT via IP aliasing must be taken into consideration？（）A
The clients must support gratuitous ARP.B
The network type must support gratuitous ARP.C
Additional TCP/IP interfaces must be allocated for backup in case of failure.D
Using IPAT via IP aliasing will reduce the number of rotating resource groups that can be used.
考题
单选题It is that reduce the BOD by converting the organic content of the sewage to a chemically and organically inert sludge（）A
the bacteriaB
oxygenC
oxidizing functionD
agitation function
考题
单选题An artificial sweetener, such as aspartame or sucralose, is said to contain no calories by the body’s not converting it into energy.A
by the body’s not converting it into energyB
by the body’s not convening them into energyC
because the body does not convert them into energyD
due to the body’s not converting the energy in themE
because the body does not convert it into energy
考题
单选题In the United States, both genomicists and plant scientists want to find out ______.A
the way converting sugars from crops such as corn or sugarcane to ethanol.B
how to process cellulose from the cell walls of stems and leaves.C
how to increase the oil content of oil-producing crops.D
how to make high-energy plants.
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