题目
题型：0114 期中题难度：来源：
plants can have their temperature taken from 3, 000 feet away straight up. A decade ago, adopting the infrared
(红外线) scanning technology developed for military purposes and other satellites, physicist Stephen Paley
came up with a quick way to take the temperature of crops to determine which ones are under stress. The
goal was to let farmers precisely aim at pesticide (***虫剂) spraying rather than rain poison on a whole field,
which was sure to include plants that don"t have pest (害虫) problems.
Even better, Paley"s Remote Scanning Services Company could detect crop problems before they became
visible to the eye. Mounted on a plane flown at 3, 000 feet at night, an infrared scanner measured the heat
given out by crops. The data were transformed into a color-coded map showing where plants were running
"fevers". Farmers could then spot-spray, using 50 to 70 percent less pesticide than they otherwise would.
The bad news is that Paley"s company closed down in 1984, after only three years. Farmers resisted the
new technology and long-term backers were hard to find. But with the increasing concern about pesticides
on produce, and improvement in infrared scanning, Paley hopes to get back into operation. Agriculture experts
have no doubt the technology works. "This technique can be used on 75 percent of agricultural land in the
United States," says George Oerther of Texas A & M. Ray Jackson, who recently retired from the Department
of Agriculture, thinks remote infrared crop scanning could be adopted by the end of the decade. But only if
Paley finds the financial backing which he failed to obtain 10 years ago.
B. facing an infrared scanner
C. in poor physical condition
D. exposed to extreme sun rays
B. measure the size of the affected area
C. draw a color-coded map
D. locate the problem area
B. consulting infrared scanning experts
C. transforming poisoned rain
D. detecting crop problems at an early stage
B. its high cost
C. the lack of financial support
D. its failure to help increase production
B. growing concern about the over use of pesticides on crops
C. the forceful promotion by the Department of Agriculture
D. full support from agricultural experts
答案
核心考点
试题【阅读理解。 Even plants can run a fever, especially when they"re under attack by i】；主要考察你对题材分类等知识点的理解。[详细]
举一反三
Every year when the Italian artist Michelangelo"s (1475－1564, 意大利文艺复兴时期著名雕刻家、画家、
建筑师) birthday comes around, computer users all over the world are filled with fear (害怕) and use their
computers with care. Some may even choose not to turn on their computers on March 3. All this fear and care
are just because a deadly computer virus is ready to cause damages (破坏) on that day.
What"s a computer virus then? Why do people get so afraid of it?
A computer virus is, in fact, a little program that is put into other programs and that does something bad.
It is called a virus because, like any real-life viruses such as AIDs virus, it reproduces itself. And when these
programs are run, the virus is brought to life. It hides itself in your computer system waiting for the right
moment to make damages. And at the same time it keeps producing itself by copying itself onto other programs.
The Michelangelo virus waits until the artist"s birthday comes around, and then it will wake up to do very
bad things like destroying you files (毁坏文档). So next time when you turn on your computer, look out for
computer viruses!
B. was born on March 3, 1475
C. died six centuries ago
D. died on March 3, 1564
B. a kind of computer virus will come on that day
C. a deadly computer virus called "the Michelangelo virus" will wake up and then damages that day
D. something will easily go wrong with computers
B. a kind of real-life virus
C. a kind of virus like AIDS virus
D. also a kind of program which is placed into other programs and which makes damages
B. only on March 3
C. on Fridays
D. only on some famous artists" birthdays
kind of loneliness is not serious. In fact, it is quite normal. For some people, though, loneliness can last for
years. Now researchers say there are three different types of loneliness.
The first kind of loneliness is temporary (暂时的). This is the most common type. It usually disappears
quickly and does not require any special attention. The second kind, situational loneliness, is a natural result
or a particular situation-for example, a family problem, the death of a loved one, or moving to a new place.
Although this kind of loneliness can cause physical problems, such as headaches and sleeplessness, it usually
does not last for more than a year.
The third kind of loneliness is the most severe. Unlike the second type, chronic (长期的) loneliness usually
last more than two yeas and has no specific cause. People who experience habitual loneliness have problems
socializing and becoming close to others. Unfortunately, many chronically lone people think there is little or
nothing they can do to improve their condition.
Psychologists (心理学家) agree that one important fact in loneliness is a person"s social contacts, e.g,
friends, family members, co-workers, etc. We depend on various people for different reasons. For instance,
our families give us emotional support, our parents and teachers give us guidance, and our friends share similar
interests and activities. However, psychologists have found that, though lone people may have many social
contacts, they sometimes feel they should have more. They question their own popularity.
Psychologists are trying to find ways to help habitually lonely people for two reasons: they are unhappy
and unable to socialize and there is a connection between chronic loneliness and serious illness such as heart
disease. While temporary and situational loneliness can be a normal, healthy part of life, chronic loneliness
can be a very sad, and sometimes dangerous condition.
B. Just ignore it
C. Go to see a doctor
D. Ask your teachers for guidance
B. lonely people don"t have many social problems
C. one problem of loneliness is a person"s social contacts
D. we depend on various people for different reasons
B. Chronic loneliness can cause serious illness
C. Chronic loneliness cannot be overcome
D. A, B, and C are all correct
B. Loneliness and Diseases
C. Loneliness and Social Contacts
D. Chronic Loneliness
or her second year of high school is required to take a class in driver"s education. However, unlike other
courses, it is not given during the regular school year. Instead it is a summer course.
The course is divided up into two parts: class time for learning laws and regulations, and driving time to
practise driving. Class time is not unlike any other class. The students study the basic traffic laws from a text
to pass the written driving test that is given to anyone who wants to get a driver"s license.
Driving time is a chance for the students to get behind the wheel (steering wheel) and practise starting
steering, backing up, parking, switching lanes, turning corners, and all the other maneuvers (操作) required
to drive a car. Each student is required to drive a total of six hours. The students are divided up into groups
of four. The students and the instructor go out driving for two hour blocks of time. Thus, each student gets
half an hour driving time per outing. The instructor and "driver" sit in the front seats and the other three
students sit in the back.
After the student has passed the driver"s education course and reached the appropriate age to drive (this
age differs in every state but in most cases the person must be 16 years old), they can go to a designated (指
定的) state office to take their driver"s test, which is made up of an eye examination, a written test, and a
road test. The person must pass all three tests in order to be given a driver"s license. If the person did well in
his or her driver"s education class, he or she will pass the test with flying colors and get a driver"s license.
B. is given to anyone wanting to get a driver"s license
C. is carried on at the same time as other courses
D. is offered to all the students of Grade 2 in high schools
B. get half an hour driving
C. drive for two hour blocks of time
D. go out driving for twelve times
B. They must be 16 years of age.
C. They should go to have their driver"s test.
D. They ought to do well in their driver"s course.
B. quickly
C. colorfully
D. successfully
that protect the environment such as solar energy are becoming possible alternatives.
Increasing demand for clean, renewable energy is driving a growing market for solar energy products..
Two of the main types of products that take advantage of solar energy are passive and active solar products.
These two types of systems differ in how they are constructed and can also differ greatly in cost. Passive solar
technology can be used to heat air or water directly using the sun"s energy. Unlike an active solar application,
passive solar set-ups accomplish their task without the use of additional electrical components, such as fans
that need an external electricity supply. Some solar space heating or water heating systems are active solar
heating systems that have various components that call for external power sources. Because of their simplicity
compared with active systems, passive solar heating systems generally are cheaper than active ones.
In addition to these solar heating systems, there are also solar power system available. Rather than using the
sun"s energy for heating applications, these systems change solar energy into electricity. An important part of
these products is called photovoltaic cells, which generate electricity from light. As sunlight falls on a
photovoltaic cell, the light"s energy is changed into electricity that can then be used to power many kinds of
electronic devices. Because of the complicated technology involved, these kinds of solar power systems can
be very expensive.
When considering what kind of solar heating or power system to install (安装) in your home or business,
be sure to purchase your equipment from a reputable manufacturer who will be able to help you with any
necessary repair.
Solar energy application 
Batteries can power anything from small sensors to large systems. While scientists are finding ways to
make them smaller but even more powerful, problems can arise when these batteries are much larger and
heavier than the devices themselves. University of Missouri(MU) researchers are developing a nuclear energy
source that is smaller, lighter and more efficient.
"To provide enough power, we need certain methods with high energy density (密度)", said Jae Kwon,
assistant professor of electrical and computer engineering at MU. "The radioisotope (放射性同位素) battery
can provide power density that is much higher than chemical batteries."
Kwon and his research team have been working on building a small nuclear battery, presently the size and
thickness of a penny, intended to power various micro / nanoelectromechanreal systems (M/NEMS). Although
nuclear batteries can cause concerns, Kwon said they are safe.
"People hear the word "nuclear" and think of something very dangerous," he said, "However, nuclear power
sources have already been safely powering a variety of devices, such as pace-makers, space satellites and
underwater systems."
His new idea is not only in the battery"s size, but also in its semiconductor (半导体). Kwon"s battery uses
a liquid semiconductor rather than a solid semiconductor.
"The key part of using a radioactive battery is that when you harvest the energy, part of the radiation energy
can damage the lattice structure (晶体结构) of the solid semiconductor," Kwon said, "By using a liquid semicon
ductor, we believe we can minimize that problem."
Together with J. David Robertson, chemistry professor and associate director of the MU Research Reactor,
Kwon is working to build and test the battery. In the future, they hope to increase the battery"s power, shrink
its size and try with various other materials. Kwon said that battery could be thinner than the thickness of
human hair.
B. He developed a chemical battery.
C. He is working on a nuclear energy source.
D. He made a breakthrough in computer engineering.
B. to introduce nuclear batteries can be safely used.
C. to describe a nuclear-powered system.
D. to introduce various energy sources.
B. test the power of nuclear batteries
C. decrease the size of nuclear batteries
D. reduce the damage to lattice structure
B. test the power of nuclear batteries
C. decrease the size of nuclear batteries
D. reduce the damage to lattice structure
B. book review
C. newspaper ad
D. science fiction story
最新试题
- 1填空。（1）《土地的誓言》是一篇___________（文体），充溢着饱满、深沉的爱国热情。文题“土地的誓言”可理解为_
- 2计算：2×（-2）3-4÷（-12）+20=______．
- 3已知y=ax2+bx的图象如图所示，则y=ax﹣b的图象一定过[ ]A．第一、二、三象限B．第一、二、四象限C．
- 4在森林古猿进化成人的过程中，下列哪一项是人类的主要标志？（ ）A．能直立行走B．使用工具C．产生了语言D．脑量增加
- 5葡萄的果实属于（ ）A．保护组织B．基本组织C．营养器官D．生殖器官
- 6如图所示，电源电压恒定．闭合开关S1、S2，电压表示数为9V，电流表示数为1.5A；断开开关S2，电压表示数为6V。则R
- 72009年9月10日，温家宝总理在2009夏季达沃斯论坛上发表了题为《全面提升中国经济发展内在动力》的重要讲话。温家宝总
- 8资料表明，近年来北冰洋海冰融化速度加快，流出北冰洋的洋流增强。同期，墨西哥湾暖流较为稳定，北大西洋暖流速度减缓。据此并读
- 9【题文】下列词语中，没有错别字的一组是
- 10溶液的碱性强弱跟溶液中OH－的数量有关。一定体积的溶液中OH－数量越多，则溶液碱性越强。100m1 10%的NaOH溶液
热门考点
- 1已知a=（-2，1），b=（t，-2），若a与b的夹角为钝角，则实数t的取值范围为______．
- 2Our headmaster will ______ us in the discussion this afterno
- 3陈独秀曾著文指出：“三年以来，吾人于共和国体之下，备受专制政治之痛苦。自经此次之实验，国中贤者，宝爱共和之心，因以勃发；
- 4下面句子中没有词类活用现象的一项是[ ]A ．北方有辱臣者，愿借子***之 B ．在宋城上而待楚寇矣 C
- 5下列解决青藏高原牧区能源问题的最合理措施是 [ ]A、樵采天然植被B、开发利用太阳能C、大力发展薪炭林D、加大煤
- 62009年1月5日，由国务院新闻办、公安部等7部门联合开展的全国整治互联网低俗之风专项行动正式启动。这一举措①有利于为青
- 7 (1"4分)阅读材料，回答问题：材料一 西周时，耒、耜是主要农具， “一人跖(踏)耒而耕，不过十亩”。战国时，李悝说
- 8已知定义在R上的奇函数f（x）和偶函数g（x）满足f（x）+g（x）=ax-a-x+2（a＞0且a≠1），若g（2）=a
- 9我国古代梁桥著名，其中最古老的石拱桥是（ ）A．泸定桥 B．颐和园的玉带桥C．泉州的洛阳桥D．赵州桥
- 10在电解水的化学反应中，H2O、H2、O2的质量比为 [ ]A.9:1:16 B.9:1:8 C.9:2:8 D.