题目
题型：0103 月考题难度：来源：
by day and pale by night. The crab"s changing colour follows a regular twenty-four hour plan that exactly
matches the daily rhythm of the sun.
Does the crab actually keep time, or does its skin simply answer to the sun"s rays, changing colour
according to the amount of light which strikes it? To find out, biologists kept crabs in a dark room for two
months. Even without daylight, the crab"s skin colour continued to change exactly on time.
This characteristic probably developed gradually in answer to the daily rising and setting of the sun, to help
protect the crab from sunlight and enemies. After millions of years it has become completely controlled inside
the living body of the crab.
The biologists noticed that once each day the colour of the fiddler crab is especially dark, and that each day
this happens fifty minutes later than on the day before. From this they discovered that each crab follows not
only the rhythm of the sun but also that of the tides (潮水). The crab"s period of greatest darkening is exactly
the time of low tide on the beach where it was caught!
B. protects the crab from the sunlight and enemies
C. keeps the crab warm
D. is of no real use
B. changed colour more quickly
C. changed colour more slowly
D. changed colour on the same timetable
B. over millions of years
C. by the work of biologists
D. both A and B
B. Discoveries in Biology
C. A scientific Study
D. A Living Clock
答案
核心考点
试题【阅读理解。 The fiddler crab (蟹) is a living clock. It indicates the time of day b】；主要考察你对题材分类等知识点的理解。[详细]
举一反三
research shows that chemicals added to our local water supply to kill harmful bacteria can have unwanted
side effects. These chemicals can cause potential harm through drinking and in seemingly harmless activities
as cleaning one"s house. They are released (set free) from water by daily actions like water running out of tap,
spraying from garden pipes, or splashing in dishwashers and washing machines. As the water is moving, these
chemicals are released into the air and then breathed in. Once inside our bodies, they start to affect our health.
Does this mean we should stop bathing? No, say the scientists, but we should put all pollution into
perspective. Activities at home such as the burning of coal, cooking oil, or even candles release carbon
monoxide and particulates such as cigarette ashes which have been proven as harmful to health as working or
living near heavy traffic. New rugs, bedding, and even clothing give off that "new smell," which is a sure sign
of chemicals. In the office, newly applied paint, newly purchased telephones and other telecommunications
equipment, and computers release polluting chemicals, too. As offices and homes often have inadequate
ventilation (通风), these chemicals can build up to become health problems. Their poisonous effects are only
now being slowly recognized.
These facts suggest that, at a minimum, proper airing of newly purchased goods with an obvious chemical
smell is a wise warning. Home and office windows should be opened during good weather. Evenone"s car
needs to be ventilated as well while in the garage.
We need further research to understand better other potential health dangers, too. For example, the effects
of overcrowding of schools (carbon dioxide build-up), the factory work environment (an endless list of
potentially dangerous substances), and even home heating and cooling (the air conditioner may be our enemies,
not our friends) have only recently started to come to light. Until we understand the effects of our new
technological environment better, we can only hope that "there is no place like home."
B. The water in everyday use is unsafe.
C. Chemicals are added to the drinking water.
D. Chemicals are released in the running water.
B. homes and offices should be aired often
C. any pollution should be taken into consideration
D. we should prevent any pollution from doing harm to us
B. To show us that no place is like home.
C. To make us aware of the pollution around us.
D. To argue that neither homes nor offices are safe.
anger, or joy, typically make Americans feel uncomfortable and embarrassed. The shedder of tears (落泪者)
is likely to apologize, even when a great tragedy was the cause. The observer of tears is likely to do everything
possible to put an end to the emotional tears. But judging from recent studies of crying behavior, both those
responses to tears are often inappropriate and may even be counterproductive (适得其反).
Humans are the only animals clearly known to shed emotional tears. Since evolution has given rise to few
purposeless physiological responses, it is logical to assume that crying has one or more functions that enhance
(increase) survival.
Although some observers have suggested that crying is a way to ask for assistance from others (as a crying
baby might from its mother), the shedding of tears is hardly necessary to get help. Loud cries would have been
quite enough, more likely than tears to gain attention. So, it appears, there must be something special about tears
themselves.
Indeed, the new studies suggest that emotional tears may play a direct role in reducing stress. University of
Minnesota researchers who are studying the chemical composition of tears have recently separated two
important chemicals from emotional tears. Both chemicals are found only in tears that are shed in response to
emotion. Tears shed because of exposure to cut onion would contain no such substance.
Other researchers are mvestigating the usefulness of tears as a means of making a careful examination of
human ills and monitoring drugs. At Tulane University"s Tear Analysis Laboratory, Dr. Peter Kastl and his
colleagues report that they can use tears to detect drug abuse, to study the causes of "dry eye" syndrome (综合
症) and the effects of eye surgery, and perhaps even to measure exposure to environmental pollutants.
B. The embarrassment and unpleasant feeling of the observers.
C. The tear shedder"s apology and the observer"s effort to stop the crying.
D. Linking illness with crying and finding the chemical composition of tears.
B. we can reduce our stress by shedding tears
C. shedders of tears can"t get help by crying loudly
D. unlike animals, humans can shed tears for survival
B. Functions of shedding tears.
C. Unwelcome shedders of tears.
D. Research on the effects of tears.
It is my understanding that this college has received a large donation to be used to enhance (improve) the
quality of life for students: expand the bookstore or add computers to the computer lab. It is the tradition of
this school to promote education and to be the pioneer of new technology. That is why I strongly argue in
favor of the addition of more computers to the computer lab.
Although expanding the campus bookstore to include CDs, gifts, and a snack bar will give a nicer look to
the college, we have to think about a greater goal and a more practical way to enhance the quality of life for
students. What do we want for our students and our college? Do we want our college to be known as a place
with a great bookstore where you can find CDs and gifts, or as a place where the students can explore and
research in their field using the best tools provided by technology? In addition, there are already several snack
bars on campus, and there are music stores nearby, so students do not depend on the college bookstore for
these things.
We live in a highly technological world and computers play an increasing"y important role in how we live.
As a learning institution, this college has the responsibility to offer its students the best technology to help them
prcpare for their future. Many students will be expecting to be familiar with the latest software and other tools
when they go on to work or to graduate school.
While they are in college, students find they are expected to use computers. Many professors expect
students to use computers to do homework or to complete projects. Since students are competing for good
grades, those who have limited access to computers are at a great disadvantage. Furthermore, being able to do
projects using the computer enhances the process of leaming.
If there are more computers, no more will students have to wait in line while scanning the room for an
empty chair and computer. No longer will they have to sit and wait while an outdated computer struggles to
follow their commands. Having more new and faster computers available will enable students to finish their
work more quickly.
The more computers are used in society, the more colleges will depend on them as a tool of teaching and
learning. Making computers more available to students facilitates their learning process by making the process
casier, more interesting, more engaging, and in the process enhancing their quality of life.
B. to explain why students are in great need of computers
C. to tell us what benefits students can gain from computers
D. to persuade the Dean to purchase more advanced computers
B. computers in the college will be updated to meet the students" demands soon
C. the college has the responsibility to help the students to prepare for their future
D. it is also necessary to expand the college bookstore by using part of the donation
B. computers are helpful to students" competition for success
C. students find it convenient to do assignments by using computers
D. students wish to use the money to buy more advanced computers
B. 
C.
D. 
However difficult you find it to arrange your time, it will pay off in the long run if you set aside a certain
part of the day for studying-and stick to it. 1_____. But don"t forget to make sure that you have enough left
for recreational activities or simply to be "with" yourself; reading a novel or watching a television programme.
As part of your weekly schedule, it is also advisable to consider exactly what you have to do in that week,
and make sure that you handle the"most significant tasks first. 2_____.
On a physical level, make sure you have an area or space for studying. 3_____. If you always study in the
same place: preferably a room of your own, you will find it easier to adjust mentally to the activity when you
enter that area. You should have everything that you might need at hand.
Make sure that all the physical equipment that you use, such as a desk, chair etc. is at good height for you.
If you use a personal computer, there are plenty of guidelines available from the government on angles, lighting
and the like. 4_____.
If you are working on topic your teacher has set, but finding it hard to concentrate, it may be that you
actually need to take your mind right off it for 8 period of time. 5_____. After a period away from the task,
having not thought about it at all, you may return to it refreshed and full of ideas.
B. It"s all too easy to read something and then forget where it came from
C. Consult these and avoid the typical student aches and pains
D. "Airing the mind" can work wonders sometimes
E. Make use of equipment that is available to you
F. It is best to make a weekly schedule
G. Don"t do it just anywhere
the worlds" leading genome sequencing (基因图谱) company has predicted.
A complete DNA read-out for every newborn will be technically possible and affordable in less than five
years, promising a revolution in healthcare, says Jay Flatley, the chief executive of Illumina. Only social and
legal problems are likely to delay the age of "genome sequences," or genetic profiles. By 2019 it will have
become routine to map infants" genes when they are born, Dr Flatley told The Times.
This will open a new approach to medicine, by which conditions such as high blood pressure and heart
disease can be predicted and prevented and drugs used more safely and effectively.
A baby"s genome can be discovered at birth by a blood test. By examining a person"s genome, it is possible
to identify raised risks of developing diseases such as cancers. Those at high risk can then be screened more
regularly, or given drugs or dietary advice to lower their chances of becoming ill.
Personal genomes could also be used to ensure that patients get the medicine that is most likely to work
for them and least likely to have side-effects.
The development, however, will raise legal concerns about privacy and access to individuals" genetic
records.
"Bad things can be done with the genome. It could predict something about someone-and you could
possibly hand the information to their employer or their insurance company," said Dr Flatley.
"People have to recognize that this horse is out of the barn, and that your genome probably can"t be
protected, because everywhere you go you leave your genome behind. Complete genetic privacy, however,
is unlikely to be possible", he added.
As the benefits become clearer, however, he believes that most people will want their genomes read and
interpreted. The risk is nothing compared with the gain.
B. the promise of a leading company
C. the information of babies" genes
D. the research of medical scientists
B. The risk of developing diseases at birth.
C. The side-effects of medicine on patients.
D. The letting out of personal genetic information.
B. Genetic mapping technique is too horrible to control.
C. People are eager to improve genetic mapping technique.
D. People can"t stop genetic mapping technique advancing.
B. Conservative.
C. Positive.
D. Doubtful.
最新试题
- 1不定项选择不同的物理量可以有相同的单位。下列各组物理量中有相同单位的是（ ）A．速度和角速度B．电压和电动势C．电势
- 2The world ______. Things never stay the same.A．changesB．is c
- 3将等物质的量的A、B混合于2 L的密闭容器中，发生如下反应：3A(g)＋B(g)xC(g)＋2D(g)，经5 min后，
- 4人晕车、晕船，主要原因是_____受到过强或长时间的刺激而引起的。[ ]A．前庭和半规管B．心脏C．大脑D．小脑
- 5有一个班集体学习氛围很好。口语优异的英语课代表每天为同学们用英语讲一个小故事；酷爱文学的语文课代表为同学们精心选取”；数
- 6解方程：
- 7【题文】设全集是（ ）A．B．C．D．
- 8下列离子组在指定溶液中一定能大量共存的是（ ）A．c（I-）=0.1 mol•L-1的溶液中：Na+、Fe3+、ClO
- 9列出我们地区常见到的鸟。
- 10量取液体体积时，量筒应放 _________ ，视线与 _________ 相平，然后读数，若仰视，读数会 ______
热门考点
- 1四个图形是如图的展开图的是（ ）A．B．C．D．
- 2在经济体制改革的过程中，小岗村不断探索致富之路。2011年1月，该村决定重新走上合作经济的道路，规划了“调整产业结构、发
- 3如图所示，质量为为m、电量为q的带电粒子，经电压为U加速，又经磁感应强度为B的匀强磁场后落到图中D点，求A、D间的距离和
- 4从方框中选择适当的句子补全对话。(10分) A: Hello!B: Hello,Jane! 小题1: A: Hi, K
- 5如图所示，为了使杠杆OA保持水平，可分别在A点沿不同方向施加作用力F1或F2或F3．这三个力的大小关系是（ ）A．F
- 6如下图所示是实验中常见的化学仪器，相信你已使用过。请接下列要求把仪器的名称填在横线上。(1)给液体、固体加热，需要用__
- 7人体的生命活动受到 的调节，同时也受到 的影响。
- 8【题文】选出对加横线的词解释错误的项（单选题）①君不如袒伏斧质请罪（请求，请求对方做某件事）②请奉盆缶秦王以相娱乐（请求
- 9有人预测：在2010年的广州亚运会上，排球赛决赛将在中国队与日本队之间展开，据以往统计， 中国队在每局比赛中胜日本队的概
- 10金属元素和人体健康有很大关系。钾元素可以调节体液平衡，维持肌肉和神经的功能及代谢。如果人体缺钾会出现肌肉、心律不齐等症状