题目
题型:专项题难度:来源:
with the portable computer in business class. In the last 15 years, pilots have reported well over
100 incidents that could have been caused by electromagnetic interference. The source of this
interference remains unconfirmed, but increasingly, experts are pointing the blame at portable
electronic devices such as portable computers, radio and cassette players and mobile telephones.
RTCA, an organization which advises the aviation(航空) industry, has recommended that all
airlines ban such devices from being used during "critical" stages of flight, particularly take-off
and landing. Some experts have gone further, calling for a total ban during all flights. Currently,
rules on using these devices are left up to individual airlines. And although some airlines prohibit
passengers from using such equipment during take-off and landing, most are reluctant to enforce
a total ban, given that many passengers want to work during flights.
The difficulty is predicting how electromagnetic fields might affect an aircraft"s computers.
Experts know that portable devices emit radiation which affects those wavelengths which
aircraft use for navigation and communication. But, because they have not been able to reproduce
these effects in a laboratory, they have no way of knowing whether the interference might be
dangerous or not.
The fact that aircraft may be vulnerable (易受损的) to interference raises the risk that
terrorists may use radio system in order to damage navigation equipment. As worrying, though,
is the passenger who can"t hear the instructions to turn off his radio because the music"s too loud.
B. the defects of electronic crashes
C. a possible cause of aircraft crashes
D. effective safety measures for air flight
B. They may have taken place during take off and landing.
C. They were proved to have been caused by the passengers" portable computers.
D. They were suspected to have resulted from electromagnetic interference.
B. the harmful effect of electromagnetic interference is yet to be proved.
C. most passengers refuse to take a plane which bans the use of radio and cassette players.
D. they have other effective safety measures to fall back on.
computers?______
B. Because it remains a mystery what wavelengths are liable to be interfered with.
C. Because research scientists have not been to produce the same effects in labs.
D. Because experts lack adequate equipment to do such research.
B. has overestimated the danger of electromagnetic interference
C. hasn"t formed his own opinion on this problem
D. regards it as unreasonable to exercise a total ban during flight
答案
核心考点
试题【阅读理解。 The biggest safety threat facing airlines today may not be a terrorist】;主要考察你对题材分类等知识点的理解。[详细]
举一反三
Weiming, who has killed five and injured some others in Chengdu, Sichuan. However, such a case is not
rare.
Today, traffic accidents may have been regarded as a social problem. The car has killed and disabled more people in its brief history than any bomb or weapon ever invented. Much of the blood on the street
flows actually from rude behavior of drivers who refuse to respect the legal and moral rights of others. In
fact, the enemies of society on wheels are rather harmless but just ordinary people acting carelessly, you
might say. But it is a principle both of law and common morality that carelessness is no excuse when one"s actions could bring death or damage to others. A minority of the killers go even far beyond carelessness
that can be imagined.
Researchers have estimated that as many as 80 percent of all automobile accidents can be attributed to the psychological condition of the driver. Emotional upsets can change drivers" reactions, slow their
judgment, and make them blind to the dangers that might otherwise be evident. The experts warn that it is
vital for every driver to make a conscious effort to keep his/her emotions under control.
Yet the irresponsibility that accounts for much of the problem isn"t only put upon drivers. Street walkers regularly ignore or break traffic regulations. They are blamed in most vehiclewalker accidents, and many
cyclists even believe that they are not subject to the basic rules of the road.
Significant legal advances have been made towards safer driving in the past few years. Safety standards for vehicles have been raised both at the point of manufacture and through regular road inspections. In
addition, speed limits have been lowered. Due to these measures, the accident rate has decreased. But the accident experts still worry because there has been little or no improvement in the way drivers behave. The only real and lasting solution, say the experts, is to make people believe that driving is a skilled task
requiring constant care and concentration. Those who fail to do all these things present a threat to those
with whom they share the road.
B. people usually pay no attention to law and morality when driving
C. they have caused serious psychological problems among drivers
D. the car has killed and disabled more people than any weapon in history
B. Careless people walking in the street.
C. Irresponsible auto drivers.
D. Irresponsible auto manufacturers.
B. angry and disappointed
C. objective and concerned
D. anxious and annoyed
B. help protect street walkers from car accidents
C. discuss traffic problems and possible solutions
D. warn auto drivers to refuse drunk driving
surprising.Obviously there are some pretty big differences between our behavior and theirs
in this respect.Most Chinese children seem to get whatever they want,from ice creams,sweets
and toys to endless attention from the adults around them.Is this a sort of spoiling or love?I
wonder.
Most westerners would think it is a sort of spoiling rather than love.We think love means
educating your children and bringing them up to lead an independent life.That includes learning
to accept the fact that he can"t get everything he wants.As an adult,he will not always get the
quite expensive car he hunts for;she will not always manage to acquire the beautiful dress
she longs for.So we try to teach our children early to cope with the disappointment of not
getting what they want.
I find too much such kind of love for the children can actually spoil them.To my surprise,it
seems that the life of a Chinese child is rather hard.Without doubt,the child is the very center
of a whole circle of adults,but on the other hand he or she is also expected to start studying
according to adults" wishes.Many children of my son"s age take piano lessons,painting classes
and even English lessons.It looks as if Chinese adults think that just playing without learning
anything is a waste of time.So in this respect our children appear spoiled,just because they
are allowed to play.But without this sort of play how can Western children develop such free
and rich imaginations?In fact the connection between this imagination and the creativity is so
important in the children" s future life.
B.They can play whenever they want.
C.They need not behave themselves.
D.Their demands can always be satisfied.
B.rather easy
C.independent
D.colorful
B.they can have the freedom to play
C.they can take piano lessons
D.they may have expensive toys
B.How to develop kids" imagination
C.What is the real love for children
D.The imagination and creativity
of five young people now get on with their parents,which is the opposite of the popularly held
image of unhappy teenagers locked in their room after endless family quarrels.
An important new study into teenage attitudes surprisingly shows that their family life is more
harmonious than it has ever been in the past."We were surprised by just how positive today"s
young people seem to be about their families,"said one member of the research team."They"re
expected to be rebellious (叛逆的) and selfish but actually they have other things on their minds;
they want a car and material goods,and they worry about whether school is serving them well.
There"s more negotiation (商议) and discussion between parents and children,and children expect
to take part in the family decisionmaking process.They don"t want to rock the boat."
So it seems that this generation of parents is much more likely than parents of 30 years ago to
treat their children as friends."My parents are happy to discuss things with me and willing to listen
to me," says 17yearold Daniel Lazall."I always tell them when I"m going out clubbing.As long as
they know what I"m doing,they"re fine with it." Susan Crome,who is now 21,agrees."Looking back
on the last 10 years,there was a lot of what you could call negotiation.For example,as long as I"d
done all my homework,I could go out on a Saturday night.But I think my grandparents were a lot
stricter with my parents than that."
Maybe this positive view of family life should not be unexpected.It is possible that the idea of
teenage rebellion is not rooted in real facts.A researcher comments,"Our surprise that teenagers
say they get along well with their parents comes because of a brief period in our social history
when teenagers were regarded as different beings.But that idea of rebelling and breaking away
from their parents really happened during the 1960s when everyone rebelled.The normal situation
throughout history has been a smooth change from helping out with the family business to taking it
over."
B.They dislike living with their parents.
C.They have to be locked in to avoid troubles.
D.They quarrel a lot with other family members.
B.cause trouble in their families
C.go boating with their family
D.make family decisions
B.are much stricter with their children
C.careless about their children"s life
D.give their children more freedom
"Two full inches in the first three days!"
These are the kinds of statements used in magazine,newspaper,radio and television ads,
promising new shapes and new looks to those who buy the medicine or the device.The
promoters of products say they can shape the legs,slim the face,smooth wrinkles,or in some
other way to add to beauty or desirability.
Often such products are nothing more than moneymaking things for their promoters.The
results they produce are questionable,and some are dangerous to health.
To understand how these products can be legally promoted to the public,it is necessary to
understand something of the laws covering their regulation.If the product is a drug,FDA
(Food and Drug Administration)can require proof under the Food,Drug,and Cosmetic Act
that is safe and effective before it is put on the market.But if the product is a device,FDA
has no authority to require premarketing proof of safety or effectiveness.If a product already
on the market is a danger to health,FDA can request the producer or distributor to remove it
from the market voluntarily,or it can take legal action,including seizure(查封)of the product.
One notable case a few years ago involved an electrical device called the Relaxacisor,which
had been sold for reducing the waistline.The Relaxacisor produced electrical shocks to the body
through contact pads.FDA took legal action against the distributor to stop the sale of the device
on the grounds that it was dangerous to health and life.
Obviously,most of the devices on the market have never been the subject of court proceedings
(法律诉讼),and new devices appear continually.Before buying,it is up to the consumer to judge
the safety or effectiveness of such items.
B.costly
C.unreliable
D.illegal
B.New products are more likely to be questionable.
C.The production of a device must be approved by FDA.
D.The promoters usually just care about profits.
B.if it is a device
C.if its consumers make complaints
D.if its distributors challenge FDA"s authority
B.a product whose distributor was involved in a legal case
C.a successful advertisement of a beauty product
D.an example of a quality beauty product
B.show the weakness of the law on product safety
C.give advice on how to keep young and beautiful
D.introduce the organization of FDA
noisy cities. They are moving from the peaceful hills, mountains, fields, rivers and streams of the
countryside to the busy world of streets, buildings, traffic and crowds. This movement from rural(乡下的) areas to urban areas has been going on for over two hundred years.
In many countries, the main reason people come to live in towns and cities is work. After one or two
large factories have been built in or near a town, people come to find work, and soon an industrial area
begins to grow. There is usually a_residential_area nearby, too. The families of these workers need
schools, hospitals and shops, so many people come to live in the area to provide these services and a city grows.
In every major city in the world, there is a business district where the big companies have their main
offices. In the United States, this area is usually in the city center downtown. It is here that you can see
many huge skyscrapers(摩天大楼)and office blocks. The people who work here often travel a long way
to work each day. Many of them live in the suburbs of the city, far away from the industrial area and the
city center. Some suburbs are very pleasant, with nice houses and big gardens. There are usually parks for children to play in and large department stores where you can buy all you need.
But what is the future of the big cities? Will they continue to get bigger and bigger? Perhaps not. Some major cities have actually become smaller in the last ten years, and it is quite possible that one day we will
see people moving out of the major cities and back into smaller towns and villages.
B. which is suitable for living in
C. where people can do business
D. which is near a city center
B. Because they like noisy life better than peaceful life.
C. Because they mainly want to find work there.
D. Because they are sure of having a better life there.
B. People usually work and live in the business district.
C. A business district usually lies in the city center downtown.
D. Nearly every major city has its own business district.
B. but live in the suburbs of the city
C. and live in another city
D. but live in rural areas
B. will surely continue in the future
C. may not continue in the future
D. has now stopped already
最新试题
- 1(32分)阅读材料,回答下列问题。材料一:2009年我国国企和私企增长对比表 私企国企工业增加值+18.7%+6.9%惠
- 2物理课上,同学们观察了下图所示的实验:用细线将一金属小球悬挂起来,把小球拉到一定的高度(此时细线偏离竖直方向的角度为α,
- 3完形填空。 Where I"m from, we"re pretty 1 about time. If
- 4A,B两种有机物,最简式均为CH2O,关于它们的叙述正确的是 ( )A.它们一定是同系物B.它们一定是同
- 5在一定温度下将1mol CO和9mol水蒸气放在密闭的容器中发生下列反应:CO(g)+H2O(g)CO2(g)+H2(g
- 6下列词语中没有错别字的一组是[ ]A.葱茏 绊脚石 怨天尤人 一如既往 B.迄今 名信片 提纲挈领 老成持重
- 7中国奶制品行业近年质量事件频繁发生,“三聚氰胺”等添加剂对市场产生了一系列的负面影响。四川省质量技术监督局2008年第二
- 8Reading comprehension. Almost a decade ago, the federal
- 9地球上的多数生物都集中生活在地表以上,水面以下各多少米范围之内[ ]A.90米 B.80米 C.100
- 10It was in that house the old man died. A. w
热门考点
- 1如图所示,质量为m的木块从A 点水平抛出,抛出点离地面高度为l,不计空气阻力.在无风情况下落地点B 到抛出点的水平距离为
- 2如果让你调查一块草原草的密度,你会采用的调查方法是( )A.一棵一棵的数B.分格计算再累加C.选点抽样调查D.大体估算
- 3短文理解。根据你所听到的短文内容和五个问题,从A、B、C中选出一个与你所听到的短文内容相符的答案,短文读2遍。 1.Wh
- 4If you go for a long ride in a friend’s car , it’s the custo
- 5南亚农业生产影响最大的是:A.东南季风B.东北季风C.西南季风D.西北季风
- 6如图为“位移传感器、数据采集器等仪器研究加速度和力的关系”的实验装置。(1)在该实验中必须采用控制变量法,应保持____
- 7已知函数.(1)若不等式的解集为,求实数的值;(2)在(Ⅰ)的条件下,若存在实数使成立,求实数的取值范围.
- 8随着经济的发展,消费方式的多样化,银行推出了多种消费贷款。如果你要到银行申请一笔住房贷款,可以到以下银行去办理( )A.
- 9下列有关金属说法正确的是( )A.铝在空气中能生成一层致密的氧化物保护膜B.铜的化学性质不活泼,在潮湿的空气中也不生锈
- 10下列实验操作中,不正确的是[ ]A.用铂丝蘸取某溶液置于酒精灯火焰上灼烧,直接观察火焰颜色,检验K+的存在 B.