2014年12月英语四级冲刺全真模拟试题六

　　根据下面资料，回答51-70题：

　　Police in the popular resort city Virginia Beach recently began operating video surveillance cameras with controversial face recognition technology.Virginia Beach and Tampa in Florida two cities in me United States acquired the technology，which cost them$197，000."Before we switched it on.we went through an extensive public education process with hearings and the in evolvement of citizen groups and minority groups，who helped write the policies we are using，said deputy police chief Greg Mullen.A citizens' auditing committee has the right to perform unannounced spot checks on police headquarters to make sure the technology is not being misused.

　　Three of the city's l3 cameras are linked full time to the face recognition system，though the others can be activated as needed.The database of wanted people is updated every day. So far，the system has failed to produce a single arrest，though it has generated a few false alarms.It works by analyzing faces based on a series of measurements，such as the distance from the tip of the nose to the chin or the space between the eyes.Critics say it is highly inaccurate and can be easily fooled. Mullen，who sees the system eventually being linked to the databases of other city，state and federal law enforcement agencies to track criminals and suspected terrorists，said，"The system doesn't look at skin color or your hair or your gender.It takes human prejudices out of the equation."

　　"This technology has little or no effect on the crime rate but it does have an effect on people's behavior.People feel cowed，"said Bruce Steinhardt，who directs the technology.Despite the fact that tests have shown faces recognition only works in around 30%cases，the ACLU is alarmed that the technology may soon spread to airports.The organization also fears it，could potentially be used to monitor individual's political activities to harass law.abiding citizens.

　　"This kind of surveillance should be subject to the same procedures as wiretaps.Law enforce-ment agencies should justify why they need it and it should be tightly limited，otherwise it will soon become a tool of social control，"said Mihir Kshisagar of the Electronic Information Privacy Cen-ter. Nor does such criticism come exclusively from the political left.Lawyer John Whitehead, founder of the conservative Rutherford Institute，wrote in an editorial that the techn0109y threatened the right of each U.S.citizen to participate in society."After all，that is exactly what constant surveillance is-the ultimate implied threat of coercion."he wrote.

　　51、What does Mullen's statement in Paragraph l indicate?

　　A.Police is confident in using me technology.

　　B.Police has made preparation for the use of the technology.

　　C.Citizens have rights over managing the technology.

　　D.Police has gone through public education process.

　　52、 Why does the system fall to arrest a wanted person?

　　A.The system is not effective in recognizing people.

　　B.The system doesn't look at skin color or one's gender.

　　C.The system doesn't consider people's specific features.

　　D.The system is highly inaccurate and can be easily fooled.

　　53、 What is me ACLU's attitude to the system?

　　A.Worried.

　　B.Skeptical.

　　C.Confident.

　　D.Indifferent.

　　54、 In John Whitehead's opinion，which statement is true?

　　A.Face recognition technology may interfere with people's privacy.

　　B.Face recognition technology may enhance the country's constant surveillance.

　　C.Face recognition technology can be used in the same way wiretaps are used.

　　D.Face recognition technology can be used after its threat has been removed.

　　55、 What is this passage mainly about?

　　A.Disadvantage of face recognition technology.

　　B.Purposes of face recognition technology.

　　C.Controversial face recognition technology.

　　D.Effect of face recognition technology.

　　根据下面资料，回答56-75题：

　　Recent research had claimed that an excess of positive ions(离子)in the air can have an ill effect on people's physical or psychological health.What are positive ions? Well，the air is full of ions，electrically charged particles，and generally there is a rough balance between the positive and the negative charges.But sometimes this balance becomes disturbed and a larger proportion of positive ions are found.This happens naturally before thunderstorms, earthquakes or when winds are blowing in certain countries.Or it can be caused by a build-up of static electricity indoors from carpets or clothing made of man.made fibers，or from TV sets，duplicators or computer display screens.

　　When a large number of positive ions are present in the air many people experience unpleasant effects such as headaches，fatigue，irritability，and some particularly sensitive people suffer nausea(恶心)or even mental disturbance.Animals are also found to be affected，particularly before earthquakes：snakes have been observed to come out of hibernation(冬眠)，rats to flee from their burrows，dogs howl and cats jump about unaccountably.This has led the US Geographical Survey to fund a network of volunteers to watch animals in all effort to foresee such disasters before they hit vulnerable areas such as California.

　　Conversely，when large numbers of negative ions are present，then people have a feeling of well-being.Natural conditions that produce these large amounts are near the sea，close to waterfalls or fountains，or in any place where water is sprayed，or forms a spray.This probably accounts for the beneficial effect of a holiday by the sea，or in the mountains with tumbling streams or waterfalls.

　　To increase the supply of negative ions indoors，some scientists recommend the use of ionizers：small portable machines which generate negative ions.They claim that ionizers not only clean and refresh the air but also improve the health of people sensitive to excess positive ions.Of course，there are the detractors，other scientists，who dismiss such claims and are skeptical about negative/positive ion research.Therefore people can only make up their own minds by observing the effects on themselves，or on others，of a negative rich or poor environment.

　　After all，it is debatable whether depending on seismic readings to anticipate earthquakes is more effective than watching the cat.

　　56、According to the passage, static electricity can be caused by_______

　　A.using home-made electrical goods

　　B.wearing clothes made of natural materials

　　C.walking on artificial floor coverings

　　D.copying TV programs on a computer

　　57、What effect does excessive positive ions have on some people?

　　A.They think they are mad.

　　B.They feel very tired.

　　C.They become violently sick.

　　D.They are too tired to do anythin9.

　　58、 By observing the behavior of animals，scientists may be able to________.

　　A.prevent disasters

　　B.organize groups of people

　　C.predict earthquakes

　　D.control areas of California

　　59、 A high negative ion count is likely to be found

　　A.near a pond with a water pump

　　B.close to a slow-flowing fiver

　　C.high in some barren mountains

　　D.by a rotating water sprinkler

　　60、People should be able to come to a decision about ions.in the air if they________.

　　A.note their own reactions

　　B.move to a healthier area

　　C.observe domestic animals

　　D.watch how wealthy people behave