单选题If the symptoms
persist
, consult your doctor.
单选题In Britain and many other countries appraisal is now a tool of management. A．evaluation B．production C．efficiency D．publicity
单选题This is the remarkable food in this area, which is worldly famous.A. particularB. characteristicC. famousD. special
单选题
Exercise Being Good or Bad
Can exercise be a bad thing? Sudden death during or soon after strenuous
exertion on the squash court or on the army training grounds, is not unheard of.
{{U}} {{U}} 1 {{/U}} {{/U}}trained marathon runners are not
immune to fatal heart attacks. But no one knows just {{U}} {{U}} 2
{{/U}} {{/U}}common these sudden deaths linked to exercise are. The
registration and investigation of such {{U}} {{U}} 3 {{/U}}
{{/U}}is very patchy; only a national survey could determine the true {{U}}
{{U}} 4 {{/U}} {{/U}}of sudden deaths in sports. But the climate of
medical opinion is shifting in {{U}} {{U}} 5 {{/U}} {{/U}}of
exercise, for the person recovering from a heart attack as {{U}} {{U}}
6 {{/U}} {{/U}}as the average lazy individual. Training can help the
victim of a heart attack by lowering the {{U}} {{U}} 7 {{/U}}
{{/U}}of oxygen the heart needs at any given level of work {{U}} {{U}}
8 {{/U}} {{/U}}the patient can do more before reaching the point where
chest pains indicate a heart starved of oxygen. The question is, should
middle-aged people, {{U}} {{U}} 9 {{/U}} {{/U}}particular, be
screened for signs of heart disease before {{U}} {{U}} 10
{{/U}} {{/U}}vigorous exercise? Most cases of sudden death in
sport are caused by lethal arrhythmias in the beating of the heart, often in
people {{U}} {{U}} 11 {{/U}} {{/U}}undiagnosed coronary heart
disease. In North America {{U}} {{U}} 12 {{/U}} {{/U}}over 35 is
advised to have a physical check-up and even an exercise electrocardiogram. The
British, on the whole, think all this testing is unnecessary. Not many people
die from exercise, {{U}} {{U}} 13 {{/U}} {{/U}}, and ECGs (心电图)
are notoriously inaccurate. However, two medical cardiologists at the Victoria
Infirmary in Glasgow, advocate screening by exercise ECG for people over 40, or
younger people {{U}} {{U}} 14 {{/U}} {{/U}}at risk of developing
coronary heart disease. Individuals showing a particular abnormality in their
ECGs {{U}} {{U}} 15 {{/U}} {{/U}}, they say, a 10 to 20 times
greater risk of subsequently developing signs of coronary heart disease, or of
sudden death.
单选题Robots May Allow Surgery in Space
Small robots designed by University of Nebraska researchers may allow doctors on Earth to help perform surgery on patients in space.
The tiny, wheeled robots,
1
are about 3 inches tall and as wide as a lipstick case, can be slipped into small incisions (切口) and computer-controlled by surgeons in different locations. Some robots are equipped
2
cameras and lights and can send images back to surgeons and others, to which surgical tools are attached, can be
3
remotely.
"We think this is going to
4
open surgery," Dr. Dmitry Oleynikov said at a news conference. Oleynikov is a
5
in computer-assisted surgery at the University of Nebraska Medical Center in Omaha.
Officials hope that NASA will teach
6
to use the robots soon enough so that surgeries could one day be performed in space.
On earth, the surgeons could control the robots themselves
7
other locations. For example, the robots could enable surgeons in other places to
8
on injured soldiers on the front line. Researchers plan to seek federal regulatory
9
early next year. Tests on animals have been successful, and tests on humans in England will begin very soon.
The camera-carrying robots can provide
10
of affected areas and the ones with surgical tools will be able to maneuver (操控) inside the body in ways surgeons" hands can"t. The views from the camera-carrying robots are
11
than the naked eye, because they
12
back color images that are magnified (放大). Because several robots can be inserted through one incision, they could reduce the amount and
13
of cuts needed for surgery, which would decrease recovery time. This is particularly
14
to those patients who have been debilitated (使虚弱) by long illness.
Eventually, Oleynikov said that the tiny robots may enable surgeons to work without ever
15
their hands in patients" bodies. "That"s the goal," Oleynikov said. "It"s getting easier and easier. We can do even more with these devices."
单选题They got in quite a
brawl
.
单选题Gambling is {{U}}lawful in{{/U}} Nevada?
单选题John has
made up his mind
not to go to the meeting.
单选题We should not sacrifice environmental protections to
foster
economic growth.
单选题The Theory of Everything
If Stephen Hawking lives until the year 2017, he will have lived more than 50 years longer than his doctors expected. When he was a college student, doctors discovered that he had a rare disease. This disease causes a gradual disintegration (分解) of the nerve cells in the brain cells that regulate voluntary muscle activity. Death almost always occurs within two or three years.
Today Stephen Hawking cannot walk or speak. He cannot move his arms or his head. He cannot taste or smell anything. And yet this man is Professor of Mathematics at Cambridge University, a position held by the famous scientist Isaac Newton in 1669.
Hawking is often described as the greatest scientist since Albert Einstein, but to the world outside science, he is also known as the man who made scientific theory understandable. His book,
A Brief History of Time
, has sold over eight million copies.
He says that since he does not have to think about his body or do any of the things other men have to worry about, such as washing the car or working in the yard, he can dedicate all of his time to thinking. This puts him in the perfect position to find the answer to the question that he has dedicated his life to. His question is: Is there a complete theory of the universe and everything in it?
Despite his tremendous physical disabilities, he has already made some very important discoveries about the origin of the universe, how the universe holds together, and how it will probably end. He has also been able to explain the secrets of "black holes" in space. Now he is looking for a set of rules that everything in our universe must obey. He calls it the Theory of Everything: He thinks that someone will have found the answer within the next 20 years.
If Stephen Hawking is able to find his Theory of Everything, he will have given the world the opportunity to understand things that will change the whole nature of science and probably also the way we live.
单选题Safety is always my primary concern. A. secondary B. least C. last D. chief
单选题The coastal area has very
mild
winter, but the central plains remain extremely cold.
单选题How to Determine a Topic for Research Because you are going to put a lot of your time and energy into your research project(项目) ,the topic is especially important. In many instances your instructor may give a specific(特殊的)topic. I[ this is done, you have little choice, but most instructors will permit or even welcome a slightly changed focus(中心)in a topic if it is supported by good thinking. In some of your classes, the instructor may present a suggested list of several topics from which you are to make a choice. If this is done, do not simply select the first idea that attracts your attention. It may be one with which you will soon become bored, or it may be one on which you would have difficulty finding all the necessary information. Looking at the topics, try to consider how you might go about developing each of them. When you find out what seems especially interesting and worthwhile(值行骄傲的), do a bit checking in the library to see if you can get the basic resources you will need. Choosing a good research topic does not necessarily mean finding something that has a lot written about it. Many times you will have to research around a topic in order to find out the most useful information. Exciting and original topics often come to mind by combining two completely different interests. Let us say that you are interested in child psychology (心理学的)and in sports. Perhaps you can combine these into a study of the effect that is watching(可得到的)on the subject, you can research the topic individually and, by putting your information together, then draw a conclusion.
单选题The colors in these artificial flowers are sure not to vanish。A. disappearB. appearC. figureD. blend
单选题{{B}}第三篇{{/B}}
{{B}}
Human Space
Exploration{{/B}} While scientists are searching the cause of the
Columbia disaster, NASA is moving ahead with plans to develop a new craft that
would replace shuttles (航天飞机) on space station missions by 2012 and respond
quickly to space station emergencies. The space agency released
the first set of mission needs and requirements several days ago for the orbital
space plane (轨道航天飞机), which would be designed to transport a crew of four to and
from the International Space Station. Although it includes few
specifics, the plan states the orbiter (轨道航天飞机) will be safer, cheaper and
require less preparation time than the shuttle. It would be able to transport
four crew members by 2012--though it would be available for rescue missions by
2010. NASA says the craft should be able to transport injured or ill space
station crew members to "definitive (决定性的) medical care" within 24
hours. The release of the requirements showed NASA remains
focused on the long-term priorities of space exploration, even as questions
exist concerning the loss of Columbia and its seven-member crew on February 1,
2003. Experts at Marshall Space Flight Center in Huntsville,
Alabama, have been working for years on a successor to the shuttle. The project,
known as the Space Launch Initiative (提案), was divided last year into two
parts--one focusing on a future launch vehicle, the other on a space station
orbiter. The orbiter is expected to be ready sooner. The
program's managers say NASA officials have told them not to alter Space Launch
Initiative in light of the Columbia disaster. U.S. President
George W. Bush asked Congress for about US $1 billion for Space Launch
Initiative in 2004, funds that would be almost equally split between the Orbital
Space Plane and Next Generation Launch
Technology.
单选题Foreign military aid was
prolonging
the war.
单选题John is Ucollaborating/U with Mary in writing an article.
单选题My father is a
physician
.
单选题According to the passage，the 1 billion funds，if granted，would
单选题The American Industry A history of long and effortless success can be a dreadful handicap, but if properly handled, it may become a driving force. When the United States entered just such a glowing period after the end of the Second World War, it had a market eight times larger than any competitor, giving its industries unparalleled economies of scale. Its scientists were the world's best, its workers the most skilled. America and Americans were prosperous beyond the dreams of the Europeans and Asians whose economies the war had destroyed. It was inevitable that this primacy should have narrowed as other countries grew richer. Just as inevitably, the retreat from predominance proved painful. By the mid-1980s Americans had found themselves at a loss over their fading industrial competitiveness. Some huge American industries, such as consumer electronics, had shrunk or vanished in the face of foreign competition. By 1987 there was only one American television maker left, Zenith. (Now there is none: Zenith was bought by South Korea's LG Electronics in July.) Foreign-made cars and textiles were sweeping into the domestic market America's machine-tool industry was on the ropes. For a while it looked as though the making of semiconductors, which America had which sat at the heart of the new computer age, was going to be the next casualty. All of this caused a crisis of confidence. Americans stopped taking prosperity for granted. They began to believe that their way of doing business was failing, and that their incomes would therefore shortly begin to fall as well. The mid-1980s brought one inquiry after another into the causes of America's industrial decline. Their sometimes sensational findings were filled with warnings about the growing competition from overseas. How things have changed! In 1995 the United States can look back on five years of solid growth while Japan has been struggling. Few Americans attribute this solely to such obvious causes as a devalued dollar or the turning of the business cycle. Self-doubt has yielded to blind pride. "American industry" has changed its structure, has gone on a diet, has learnt to be more quick-witted," according to Richard Cavanagh, executive dean of Harvard's Kennedy School of Government, "It makes me proud to be an American just to see how our businesses are improving their productivity, " says Stephen Moore of the Cato Institute, a think-tank in Washington, DC. And William Sahlman of the Harvard Business School believes that people will look back on this period as "a golden age of business management in the United States./