black

大学试题答案(课后习题答案)

单项选择题

根据短文回答 46～50 题。
Landmines
Worldwide there are estimated to be 120 million landmines(地雷)spread through 62 countries._______ (46) The United Nations is currently involved in 14 mine-clearing operations around the world but it estimates that。at current rate,it will take 1,000 years to remove all the world's landmines.
Landmines are a favorable weapon because they cost so little to produce--about 3 pounds per mine._______ (47)
Landmines cause the death or injury of 70 people a day, of whom most are civilians._______ (48)In fact,about half the landmines active today lie in unmarked fields,in countries no longer in conflict.And landmines do not only kill and maim(使残废):they also hold back economic development.In Afghanistan,for example,where the former Soviet Army laid down an estimated ten million landmines,more than half of the land which could be cultivated for agriculture is useless because it is so heavily mined.According to Eileen Maybin of the Christy Christian Aid,mines also condemn people to relying on overseas aid-aid which is often provided by governments which provided the landmines in the first place: '_______ (49)Because there are landmines on agricultural land,people are actually dependent on food aid.This is one of the ironies of the situation. That governments are providing money for food aid when,if the mines were cleared,people would be able to feed themselves.'
Forty-nine countries have so far signed the United Nations Inhumane Weapons Convention，which restricts the manufacture and export of landmines._______ (50)
But some signatories(签约国)of the UN Convention,such as the UK,continue to support the manufacture and export of these weapons.The British Government says that it won't support a complete ban because it considers the landmine a legitimate(合法的)military weapon if it is used responsibly.
A．A further 19 counties,including the USA,France,Germany and Japan,have banned all exports of landmines completely.
B．However the cost of locating and removing them is high-between 300 pounds and 700 pounds per mine.
C．A recent UN gathering of world leaders in Vienna,Austria,failed to secure a complete ban on the manufacture and sale of landmines.
D．And every year.for every 100,000 mines removed,another two million are put down.
E．Landmines are actually destroying the social fabric and economic independence of countries.
F．And many of the casualties occur in countries where war has long since ended.
第 46 题 请选择短文（46）处最佳选项
A._______
B.
Landmines
C._______
D._______
E.And
F.In
G.According
H.This
I.'
Forty-nine
J._______
K.The
L.A
M.
B．However
N.
C．A
O.
D．And
P.for
Q.
E．Landmines
R.
F．And
相关考题

单项选择题 根据短文回答 31～35 题。 A Society Without a Formal Authority In the seventeenth century, European soldiers who came across some Indian groups in the western Great Lakes found that several native tribes(部落)were living in the area without a formal leadership system.They appeared to be' quite friendly with each other without a formal authority! 'Not only did the Indians appear to lack a formal system of authority,but they also deeply hated any efforts to control their actions.All members of the tribes knew what was required of them by lifelong(一生的)familiarity with the tasks of the area。These tasks tended to be simple,since the Indians' rate of social change was slow.Thus,although subgroups such as soldiers had recognized leaders,no real authority was required.Rather than giving direct orders(which were considered rough),members of the tribes would arouse others to action by examples.It would be difficult,if not impossible,to carry out such a system in our own society.Most of US have grown up under one authority or another for as long as we can remember.Our parents,our teachers.our bosses,our government all have the recognized right under certain conditions to tell US what to d0.The authority is so much a part of our culture that it is hard for US to imagine a workable society without it.We have been used to relying on authority to get things done and would probably be uncomfortable with the Indian methods of examples on a large scale.Of course,the major reason why the Indian system would not be suitable for US is that our society is too large.The number of tasks that various members of our society have to perform. often under tight time and resource limitations could not be treated by the Indian system.In modern societies,the formal authority system is necessary to achieve any social objectives. 第 31 题 Which of the following statements about the European soldiers is correct?（ ）A．They had no leaders.B．They treated the Indian groups well.C．They came across some Indian groups.D．They found the Indian groups friendly to them.

未知题型 紫茉莉的叶片上出现绿白斑的遗传基础是什么?在下列杂交的情况下后代会出现什么类型?如果反交，结果又如何?

单项选择题 根据短文回答 31～35 题。 Sleep Necessary for Memories Burning the midnight oil before an exam or interview does harm to the performance according to a recent research which found that sleep is necessary for memories to be taken back into the brain.A good night's sleep within 30 hours of trying to remember.A new task is a required condition of having good recall in the weeks ahead,scientists have found.The research,published in the December issue of Nature Neuroscience,showed that it was the act of sleep,rather than the simple passage of time,that was critical for long-term memory formation.'We think that getting that first night's sleep starts the process of memory consolidation(巩固),'said Robert Stick gold,a sleep researcher at Harvard Medical School who conducted the latest study.'It seems that memories normally wash out of the brain unless some process nails them down.My suspicion is that sleep is one of those things that does the nailing down,'Professor Stick gold said.With about one in five people claiming that they are so chronically short of sleep that it affects their daily activities,the latest work emphasizes the less well-understood side effect-serious memory impairment(损害).Volunteers in an' experiment found it easier to remember a memory task if they were；allowed to sleep that night.But for those kept awake,no amount of subsequent sleep made up for the initial loss.Professor Stick gold's team trained 24 people to identify the direction of threediagonal(斜线形的)bars flashed for a sixtieth of a second on a computer screen full of horizontal(水平的)stripes. Half of the subjects were、kept awake that night,while the others slept.Both groups were allowed to sleep for the second and third nights to make up for any differences in tiredness between the volunteers.Those who slept the first night were significantly and consistently better at remembering the task while the second group showed no improvement despite enjoying two nights of catch-up sleep. 第 31 题 The research published in nature Neuroscience showed that what was essential to the formation of long-term memory was（ ）A．intelligence.B．time.C．food.D．sleep.

All Rights Reserved 版权所有©在线考试题库网(zxkao.com)

备案号：湘ICP备14005140号-7

经营许可证号：湘B2-20140064