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单选题
A land ethic of course cannot prevent the conversion, management, and use of the resources of soil, waters, plants and animals.
A
altercation
B
alternation
C
alteration
D
allocation
参考答案
参考解析
解析：
句意：土地伦理观并不能阻止这种改变、管理和对土壤、河流、植物、动物资源的利用。conversion改变，改造。alteration与之同义。altercation口角，争论。alternation交替，轮流。allocation配给。
更多 “单选题A land ethic of course cannot prevent the conversion, management, and use of the resources of soil, waters, plants and animals.A altercation B alternation C alteration D allocation” 相关考题
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在资源分配类型0中，使用『____』指示分配给调度UE的资源块组。(In resource allocation type 0, the use of 『____』 indicates the resources allocated to the block group scheduling UE.)
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AWhy do plants grow in some places and not in others? Why does some land have so much growing on it，while other land has almost no plants growing on it at all?To grow plants need several things． One is warmth． In very cold places almost nothing grows． Plants also need water． In very dry parts of the earth only a few unusual plants can grow． That's why dry deserts everywhere are almost not covered by trees or grass．Plants must also have a place in which to f，ut down their roots and grow． They find it diffi-culr to grow on hard land． The town is built on hard land． The plants here have only the soil found between the cracks of the stones Io grow in．Another thing plants must have before they can grow is food．Whar will happen if we try to make things grow on the sandy beach? A few plants，such as beach grass，will grow in sand，L ut most plants won-t． Even if the weather is warm enough．and we water the plants each day． Many of them will die because the sand on this beach has al-most no food for plants．( )21． According to the passage，plants need _________ things to grow well．A． twoB． threeC． fourD． five
考题
In order to prevent desertification, the author proposes _____.A.making good use of international aids
B.developing a sustainable agricultural economy
C.gaining international support
D.converting agricultural land into forest
考题
Deforestation and Desertification(沙漠化)
The Sahel zone lies between the Sahara desert and the fertile savannahs(热带大草原)of northern Nigeria and South Sudan. The word sahel comes from Arabic and means marginal or transitional ,and this is a good description of the semi-arid(半干旱) lands, which occupy much of the Western African countries of Mail, Mauritania, Niger ,and Chad.
Unfortunately, over the last century the Sahara desert has steadily crept southwards eating into once productive Sahel lands. United Nations surveys show that over 70 percent of the dry land in agriculture use in Africa has deteriorate dover the last 30 years. Droughts have become more severe, the most recent lasting over twenty years in parts of the Sahel region. The same process of desertification is taking place across southern Africa as the Kalahari desert advances into Botswana and parts of South Africa.
One of the major causes of this desert advance is poor agricultural land use, driven by the pressures of increasing population. Overgrazing一 keeping too many farm animals on the land一means that grasses and other plants cannot recover, and scarce water supplies are exhausted. Over cultivation一 trying to grow too many crops on poor land一 results in the soil becoming even less fertile and drier, and beginning to break up. Soil erosion (侵蚀) follows, and the land turns into desert.
Another cause of desertification is loss of tree cover. Trees are cut down for use as fuel and to clear land for agricultural use. Tree roots help to bind the soil together, to conserve moisture, and to provide a habitat for her plants and animals. When trees are cut down, the soil begins to dry and loosen, wind and rain erosion increase, other plant species die, and eventually the fertile top soil may be almost entirely lost, leaving only bare rock and dust.
The effects of loss of topsoil and increased drought are irreversible. They are, however, preventable. Careful conservation of tree cover and sustainable agricultural land use have been shown to halt deterioration of soils and lessen the effects of shortage of rainfall. One project in Kita in south-west Malifunded by UNDP has involved local communities in sustainable management offorest, while at the same time providing a viable(有活力的)agricultural economy. This may be a model for similar projects in other West African countries.
文章{1~5)
The Sahel zone is an area which _____.A.is covered with sad and grass
B.has a long history
C.occupies much of South Nigeria
D.belongs to Sudan
考题
共用题干
“Salty” Rice Plant Boosts HarvestsBritish scientists are breeding a new generation of rice plants that will be able to grow in soil containing salt water. Their work may enable abandoned farms to become productive once more.Tim Flowers and Tony Yeo,from Sussex University's School of Biological Sciences,have spent several years researching how crops,such as rice,could be made to grow in water that has become salty.The pair have recently begun a three-year programme,funded by the Biotechnology and Biological Sciences Research Council,to establish which genes enable some plants to survive salty conditions. The aim is to breed this capability into crops,starting with rice.It is estimated that each year more than 10m hectares（公顷）of agricultural land are lost because salt gets into the soil and stunts（妨碍生长）plants. The problem is caused by several factors. In the tropics , mangroves（红树林）that create swamps（沼泽）and traditionally formed barriers to sea water have been cut down .In the Mediterranean,a series of droughts have caused the water table to drop,allowing sea water to seep（渗透）in. In Latin America , irrigation often causes problems when water is evaporated（蒸发）by the heat , leaving salt deposits behind.Excess salt then enters the plants and prevents them functioning normally.Heavy concentrations of minerals in the plants stop them drawing up the water they need to survive.To overcome these problems,Flowers and Yeo decided to breed rice plants that take in very little salt and store what they do absorb in cells that do not affect the plants' growth.They have started to breed these characteristics into a new rice crop,but it will take about eight harvests before the resulting seeds are ready to be considered for commercial use.Once the characteristics for surviving salty soil are known,Flowers and Yeo will try to breed the appropriate genes into all manners of crops and plants.Land that has been abandoned to na- ture will then be able to bloom again,providing much needed food in the poorer countries of the world. The attitude of the author towards the research project is______.A: positiveB: negativeC: suspiciousD: indifferent
考题
共用题干
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考题
共用题干
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考题
Soil is the surface layer of the Earth that nourishes and supports the growth of rooted plants.A:accepts
B:arranges
C:feeds
D:shelters
考题
Why would a network administrator configure port security on a switch?（）A、to prevent unauthorized Telnet access to a switch portB、to limit the number of Layer 2 broadcasts on a particular switch portC、to prevent unauthorized hosts from accessing the LAND、to protect the IP and MAC address of the switch and associated portsE、to block unauthorized access to the switch management interfaces over common TCP ports
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考题
The Database Resource Manager is automatically enabled in the maintenance window that runs the Automated Maintenance Task. What is the reason for this?（）A、to prevent the creation of an excessive number of scheduler job classesB、to allow the Automated Maintenance Tasks to use system resources without any restrictionC、to allow resource sharing only among the Automated Maintenance Tasks in the maintenance windowD、to prevent the Automated Maintenance Tasks from consuming excessive amounts of system resources
考题
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考题
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考题
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考题
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考题
多选题You are managing an Oracle Database 11g database with ASM storage. The ASM disk group has the COMPATIBLE.ASM attribute set to 11.1. Which statements are true regarding extent management and allocation units in the ASM disk group？（）AThe au_size disk group attribute determines the size of allocation units in the disk group.BThe allocation unit size may vary but the extent size is fixed.CThe allocation unit size and extent size are fixed for all the disks in a disk group and cannot be changed.DExtent management is completely automated.
考题
单选题Your company has Active Directory Certificate Services （AD CS） and Network Access Protection （NAP） deployed on the network. You need to ensure that NAP policies are enforced on portable computers taht use a wireless connection to access the network. What should you do？（）A
Configure all access points to use 802.1X authenticationB
Configure all protable computers to use MS-CHAP v2 authenticationC
Use the Group Policy Management Console to access the wireless group policy settings， and enable the Prevent connections to ad-hoc networks option.D
Use the Group Policy Management Console to access the wireless group policy settings， and disable the Prevent connections to infrastructure networks option.
考题
单选题A group of users report that they can access local resources but cannot access the Internet. Which of the following should the administrator use to test connectivity？（）A
tracertB
msconfigC
routeD
net use
考题
单选题When shall the stand-on vessel change course and speed?（）A
the stand-on vessel may change course and speed at any time as it has the right of wayB
after the give-way vessel sounds one blast in a crossing situationC
when action by the give-way vessel alone cannot prevent collisionD
when the two vessels become less than half a mile apart
考题
单选题The Database Resource Manager is automatically enabled in the maintenance window that runs the Automated Maintenance Task. What is the reason for this?（）A
to prevent the creation of an excessive number of scheduler job classesB
to allow the Automated Maintenance Tasks to use system resources without any restrictionC
to allow resource sharing only among the Automated Maintenance Tasks in the maintenance windowD
to prevent the Automated Maintenance Tasks from consuming excessive amounts of system resources
考题
单选题A group of users report that they can access local resources but cannot access the Internet. Which of the following should the administrator use to test connectivity?（）A
tracertB
msconfigC
routeD
net use
考题
单选题Why does land become desert after all trees are cut down?A
Because nothing remains on land except floods.B
Because there are no longer trees to keep the rain and protect the top-soil.C
Because too much rain sinks in and washes away the top-soil.D
Because roots of the trees break up the soil.
考题
填空题The quick-growing exotic tree species are replanted in the deforested land because they can help prevent soil erosion.____
考题
单选题If the circumstances admit，（）of small alteration of course and speed shall not be taken to avoid collision.A
depressionB
oppressionC
successionD
possession
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