The world’s biggest COVID9-9 vaccine (疫苗) study started on Monday. A total of 30,00 volunteers will help test the effectiveness and safety of a shot developed by the National Institutes of Health and drug maker Moderna.
The volunteers will each receive two doses (剂量) of a shot. They will not know whether they are getting the real vaccine or false version (版本) Scientists will then closely follow the volunteers as they go about their daily activities. They want to see which group experiences a higher rate of infections (感染), especially in areas where the virus still is spreading unchecked.
Volunteers from more than 80 test areas across the country will take part in the study. Moderna said the first vaccines were given Monday morning in Savannah, Georgia. The U.S. government requires its tests of any vaccine that might be used in the country. The aim is not just to test if a vaccine works, but also to check if it is safe.
Through the government-funded COVID-19 Prevention Network, the U.S. plans a new study for vaccine candidates (候选人) each month through autumn. Each will involve30,000 newly chosen volunteers. The hope is that, by using the same rules for each study, scientists will be easily able to compare the vaccines. In August, the U.S. will carry out its final stages of Oxford University’s vaccine candidate. The study of Johnson & Johnson’s vaccine will start in September. Drug maker Pfizer also plans to carry out its own 30,000-person study this summer.
That is a lot of volunteers needed to test possible vaccines. But in recent weeks, more than 150,000 Americans have registered to volunteer for the studies, says Dr. Larry Corey. He is with the Fred Hutchinson Cancer Research Institute in Seattle, Washington. It normally takes years to create a new vaccine from start to finish. But this time, scientists are setting speed records.
1. What can be learned according to the second paragraph?A.The volunteers will be divided into two groups. |
B.A false version will influence the volunteers poorly. |
C.Every volunteer gets two doses of shot at different times. |
D.Scientists will keep the volunteers in a special place. |
A.This test involves volunteers from different countries. |
B.Some volunteers have been injected with the vaccine. |
C.The aim of the test is to see how the vaccine works. |
D.The U.S. government intends to do tests nationwide. |
A.The tests need many more than 150,000 volunteers |
B.The vaccines made in a hurry have not potential safety issues. |
C.It is hoped that vaccine is the best hope against the virus. |
D.It is better to put off using the vaccines on humans. |
A.COVID-19 Vaccine Starts Test with Volunteers |
B.Moderna Are to Develop COVID-19 Vaccine |
C.150,000 Registered to Get COVID-19 Vaccine |
D.COVID-19 Vaccine Gets Support from U.S. Government |
相似题推荐
【推荐1】For years, there has been a prejudice against science among clinical psychologists (临床心理学家). In a two-year analysis to be published in November in Perspectives on Psychological Science, psychologists charge that many clinical psychologists fail to “provide the treatments which are given the strongest evidence of effectiveness” and “give more weight to their personal experiences than to science.” As a result, patients have no guarantee that their “treatment will be informed by science.” Walter Mischel of Columbia University is even crueler in his judgment. “The disconnect between what clinical psychologists do and what science has discovered is an extreme embarrassment,” he told me, and “there is a widening gap between clinical practice and science.”
The “widening” reflects the great progress that psychological research has made in identifying the most effective treatments. Thanks to strict clinical trials, we now know that teaching patients to think about their thoughts in new, healthier ways and to act on those new ways of thinking are effective against depression, panic disorder and other problems, with multiple trials showing that these treatments the tools of psychology bring more lasting benefits than drugs.
You wouldn’t know this if you sought help from a typical clinical psychologist. Although many treatments are effective, relatively few psychologists learn or practice them.
Why in the world not? For one thing, says Baker from the University of Wisconsin, clinical psychologists are “very doubtful about the role of science” and “lack solid science training”. Also, one third of patients get better no matter what treatment (if any) they have, “and psychologists remember these successes, believing, wrongly, that they are the result of the treatment.”
When faced with evidence that treatments they offer are not supported by science, clinical psychologists argue that they know better than some study that works. A 2008 study of 591 psychologists in private practice(诊所) found that they rely more on their own and colleagues’ experience than on science when deciding how to treat a patient. If they keep on this path despite the fact that insurance companies demand evidence-based medicine, warns Mischel, psychology will “discredit itself.”
1. Many clinical psychologists fail to provide the most effective treatments because ________.A.they are unfamiliar with their patients | B.they believe in science and evidence |
C.they rely on their personal experiences | D.they depend on their colleagues’ help |
A.the cruel judgment by Walter Mischel |
B.the great progress that has been made in psychological research |
C.the fact that most patients get better after being treated |
D.the fact that patients prefer to take drugs rather than have other treatments |
A.They feel embarrassed. | B.They doubt their treatments. |
C.They are disappointed. | D.They try to defend themselves. |
A.Negative. | B.Neutral. | C.Indifferent. | D.Positive. |
【推荐2】Last week when I was reading at home, my younger sister rushed in and told me an old man was lying on the round in front of our building. I immediately took my first-aid kit and ran downstairs. He was suffering a slight heart attack. And I performed CPR on him. Luckily, an ambulance came soon and he was taken to hospital. Later that day I was told by the hospital what I did helped rescue the old man’s life.
You can gain the knowledge, skills and confidence to act in an emergency. You never know when you might need them — you could be at home, at work, at school or on holiday.
You can be a resource for your community. For your family, your neighbors or the broader community, having more people with first-aid skills helps build a stronger and more harmonious community.
You can stay safe at work. Illness and injury can happen anywhere, anytime.
A.I was happy to hear that |
B.I received a phone call from the hospital |
C.If you have the skills |
D.With first-aid knowledge you can create a safe work environment |
E.You can take first-aid courses in your community for free |
F.Here are my reasons |
G.It’s helpful to your future career |
【推荐3】Chen Wei, a high school student, was having dinner when he heard someone screaming from another table. A fellow diner, Zhang Tao, was choking on something. He was holding his throat with his face turning red, while his desperate friends were slapping him on the back. Chen wasted no time. He rushed to Zhang’s table at once. With the help of Zhang’s friends, he was able to help Zhang to his feet. Then, standing behind Zhang, Chen did the Heimlich manoeuvre. The food was instantly forced out, and Zhang began to breathe again.
Choking victims usually have only about four minutes before they collapse (崩溃) and sometimes die, leaving no time for an ambulance to arrive. To solve this problem, in 1974, an American doctor, Henry Heimlich, created the Heimlich manoeuvre, saving thousands of lives around the world. Doing the Heimlich manoeuvre is quick, practical, and easy. It is so easy, in fact, that almost anyone can lean how.
If you see someone choking, first call the emergency services. Then, make sure the victim is really choking: A choking person cannot speak. Slapping the victim’s back will often force out the obstruction. If this does not work, you can perform the Heimlich manoeuvre by standing behind him and wrapping your arms around his waist. Make a fist with one hand and place it in the upper part of his stomach. Grabbing your fist with your other hand tightly, push up and into his stomach in one motion. Continue doing this until the obstruction is forced out.
With choking victims, every minute counts. You can’t just sit there and do nothing. Luckily, Chen had learnt how to give first aid in school. Seeing Zhang choking, he remained calm and reacted immediately. Chen later said about the incident, “How could I justify sitting there and doing nothing? We are all humans, and we all have a responsibility to look after one another’s welfare”.
1. What is the Heimlich manoeuvre?A.An American doctor. | B.A choking victim. |
C.An emergency situation. | D.A first aid method. |
A.Millions of people die of it every year. |
B.Most of the victims are young children. |
C.It is minutes before a victim falls down or dies. |
D.There are no effective ways to save victims from it. |
A.To make a fist with one hand. |
B.To hold the victim’s throat with one hand. |
C.To grab your fist with the other hand tightly. |
D.To stand behind the victim who is really choking. |
A.Ambitious. | B.Cooperative. |
C.Responsible. | D.Optimistic. |
【推荐1】The American space agency NASA has launched (发射) a new instrument designed to collect data on volcanic activity and air quality. The device arrived at the International Space Station on February 21. NASA hopes the small orbiting instrument could help predict a volcanic eruption before an explosion happens.
NASA calls the instrument NACHOS, which stands for Nanosat Atmospheric Chemistry Hyperspectral Observation System. It contains imaging sensors designed to recognize gases like sulfur dioxide and nitrogen dioxide. The presence of those gases can signal possible volcanic activity.
NACHOS was built to observe trace gases in areas as small as 0. 4 square kilometers. The six-kilogram instrument is set to be deployed (部署) three months later. It will operate attached to a CubeSat, a small satellite weighing less than 10 kilograms. NASA says NACHOS will observe from about 480 kilometers above Earth’s surface.
NASA considers the instrument a “prototype”, meaning its operations and observations will be studied during its orbit, which is expected to last one year. During its year-long mission, the team will study the instrument’s performance to learn whether the technology should be further developed.
Steve Love is a scientist with the Department of Energy. He said a volcano may give off sulfur dioxide before there is any volcanic activity. Such a device could help emergency officials take early measures to protect citizens and property from volcanic eruptions. But NASA says NACHOS can help scientists on Earth in other ways, too.
The instrument can also be used to observe gas levels from natural and human-made sources that can be harmful to humans. One gas that NACHOS will search for is nitrogen dioxide, which often comes from burning fossil fuels. Identifying the gas could help scientists find areas with high levels of harmful pollution.
“When we recognize that these gases are present and can localize their sources, we have the opportunity to take action and reduce harmful health influences,” Love said.
In the past, NASA created satellites to observe these kinds of gases. But Love said those required high-resolution images and sensitive instruments that were costly to produce and operate.
Smaller devices, like NACHOS, could enable a wider use of the technology at a much lower cost. If it proves successful, the technology could also be used in Earth-based systems, NASA says.
1. What will NACHOS do to find possible volcanic activity?A.Analyze past explosions. | B.Observe the color of clouds. |
C.Identify certain gases. | D.Collect volcanic pictures. |
A.By listing detailed facts. | B.By making comparisons. |
C.By following time order. | D.By making classifications. |
A.Reduce harmful gas levels. | B.Delay volcanic eruptions. |
C.Improve satellites’ functions. | D.Help protect people’s health. |
A.It costs much less. | B.It can be used in Earth-based systems. |
C.It works longer. | D.It can be easily controlled. |
Japan's space agency is considering putting a talking humanoid(有人的特点的) robot on the ISS to watch the work while astronauts are asleep, monitor their health and stress levels and communicate to Earth through the microblogging site Twitter.
Japan's space agency JAXA announced this week that it is looking at a plan to send a humanoid robot to the space station in 2013 that could communicate with the ground through Twitter—primarily feeding photos, rather than original ideas —and provide astronauts with “comfort and companionship”.
Following up on US NASA's “Robonaut” R2 program, which is set for launch on the Discovery shuttle next week, the Japanese robot would be part of a larger effort to create and refine robots that can be used by the elderly, JAXA said in a statement.
Japan is one of the leading countries in robotics and has a rapidly aging society with one of the world's longest life expectancies.
Improving robot communication capabilities could help elderly people on Earth by providing a nonintrusive(无干扰的) means of monitoring the robot owner's health and vital signs and sending information to emergency responders if there is an abnormality, JAXA said.
“We are thinking in terms of a very humanlike robot that would have facial expressions and be able to talk with the astronauts,” said JAXA's Satoshi Sano.
The robot was being developed with the advertising and communications giant Dentsu Inc and a team at Tokyo University.
The NASA project has a humanlike head, hands and arms and uses the same tools as station crew members. The “Robonaut” called R2 is intended to carry out maintenance tasks in the station's Destiny lab.
NASA says it hopes that humanoid robots could one day stand in for astronauts during spacewalks or perform tasks too difficult or dangerous for humans.
For now, the $2.5 million NASA robot is limited to activities within the lab.
1. According to the passage, a humanoid robot, put on the ISS, shall carry out the tasks except ________.
A.keep in contact with Earth |
B.get a friend for astronauts from Japan |
C.take care of the ISS sometimes |
D.keep an eye on the health of the astronauts |
A.NASA is planning to communicate with the space station through Twitter. |
B.Japan has the largest number of elderly people. |
C.The robot program will eventually benefit the elderly. |
D.R2 program is in the charge of Japan's JAXA. |
A.robots could completely take the place of human astronauts in the future |
B.the robot program, having cost $2.5 million, can carry out all tasks |
C.many Japanese universities joined in the robot program |
D.future astronauts will become less lonely and more comfortable with the help of the robot |
【推荐3】The Maya city of Tikal is famous for its amazing palaces and temples. But something far more ordinary kept Tikal functioning: its water-purifying(净化) system, the earliest known of its kind.
Researchers recently discovered a volcanic mineral that traps microbes(微生物) and heavy metals in Tikal's largest reservoir(水库). Because the material is not found nearby, the finding suggests the presence of a man-made water-purifying device.
The finding denies the long-standing idea that the ancient worlds technological achievements belonged to the Eastern world, like Egypt, and China. The leading scientist of this research, Kenneth Tankersley says, “When talking about purifying water, the Maya were thousands of years ahead.”
Located in the forests of Central America, Tikal, is thought to have been home to more than 45,000 people. They had to struggle against a dry season lasting from November through April. Storing water in reservoirs was a solution, but that water had to be fit to drink, said Kenneth, “Keeping water clean was of great importance.”
A few years ago, the researchers were surprised to find that the largest reservoir, Corriental, had significantly fewer harmful chemicals than the others. “The water quality at Corriental was much higher.”
Somehow the Maya must have been purifying Corriental’s water, the team assumed. “The Maya used gardens as their bathrooms.” Kenneth said, “The water coming into the reservoir would not have been very clean.”
At the bottom of Corriental, scientists found four separate layers(层), each a few centimeters thick, of millimeter-scale “zeolites(沸石)”. This type of volcanic mineral can purify water and is still in widespread use today, Kenneth says, “Just about everything we drink, from bottled water to wine, runs through a zeolite purifying device.”
The Maya wouldn’t have known about the zeolite in rock, but they would have recognized the purifying effects, the researchers suggest. A zeolite-rich rock formation about 30 kilometers northeast of Tikal is the likely source of the material in Corriental reservoir, the team said last month in Scientific Reports. Water at this site “was clear and tasted good.”
1. What did the researchers find?A.A new material called zeolites. | B.The purifying effects of zeolites. |
C.An old water-purifying system. | D.High-quality water in Corriental. |
A.By building the largest reservoir. | B.By using gardens as their bathrooms. |
C.By getting rid of heavy metals. | D.By spreading four layers of zeolites. |
A.The Maya drank bottled water. | B.The ancient Maya were very bright. |
C.The system was created by accident. | D.The zeolites were found in Corriental. |
A.the original water in Corriental was not clean enough |
B.water supply in Tikal lasted from November to April |
C.all ancient technological achievements belonged to the East |
D.the Maya had a good understanding of the zeolite in rocks |
【推荐1】The world may have a new supercontinent within 200 million to 300 million years as the Pacific Ocean shrinks and closes.
Researchers at Curtin University in Australia and Peking University in China used a supercomputer to model the evolution of Earth’s tectonic plates (地质构造板块) and the formation of a future supercontinent. Their findings were published in the journal National science Review.
“Over the past two billion years, Earth’s continents have collided (相撞) together to form a supercontinent every 600 million years, known as the supercontinent cycle. This means that current continents are due to come together again in a couple of hundred million years’ time,” said lead author Dr. Chuan Huang, a research fellow in Curtin’s Earth Dynamics Research Group and the School of Earth and Planetary Sciences.
The team’s simulation showed that due to the fact that Earth has been cooling for billions of years since its formation, the thickness and strength of the tectonic plates beneath the oceans have reduced over time. As a result, the formation of a new supercontinent is more likely to happen by the closing up of the Pacific Ocean. Reducing by a few centimeters per year, the Pacific Ocean’s current reach of 10,000 kilometers will close up in less than 300 million years.
“The resulting new supercontinent has already been named Amasia because some believe that the Pacific Ocean will close when America collides with Asia. Australia is also expected to play a role in this important Earth event, first colliding with Asia and then connecting America and Asia once the Pacific Ocean closes,” Huang said.
Changes in the distribution of continents and oceans will cause changes in climates, “particularly when ocean currents are stopped by continental collision, or new ocean currents are formed when continents break apart,” said study coauthor Zheng-Xiang Li, distinguished professor in Curtin’s School of Earth and Planetary Sciences. “Earth, as we know, will be completely different when Amasia forms. The sea level is expected to be lower, and the vast interior (内陆) of the supercontinent will be very dry with high daily temperature ranges.”
Researchers expect more earthquakes as the continental plates collide. Surrounded by a new super ocean, the newly formed supercontinent will also have decreased biodiversity.
Scientists are still trying to understand Earth’s supercontinent cycle, which is driven by heat and gravity. The research team wants to establish how Earth’s tectonic plates started and when the first continents formed, as well as what kicked off the supercontinent cycle.“We are only starting to look at the entire Earth system, from its core to its atmosphere, as a closely linked system that evolved together,”Li said.
1. What leads to the formation of the new supercontinent?A.The rising temperature of the Earth. | B.The expansion of the Pacific Ocean. |
C.The reduced strength of the tectonic plates. | D.The appearance of many new tectonic plates. |
A.The involving parts. | B.Its climate pattern. |
C.The way it breaks apart. | D.Its distance from Australia. |
A.There will be a rise in the sea level. |
B.There will be lots of water in its interior. |
C.The variety of its living things will be reduced. |
D.Its temperature will stay the same all year around. |
A.The entire Earth system faces an uncertain future. |
B.The origin of the supercontinent cycle is hard to trace. |
C.The Earth’s supercontinent cycle will pose a big threat. |
D.There is more to discover about the supercontinent cycle. |
【推荐2】A hybrid electric vehicle(混合动力车)or HEV is a vehicle driven by the combination of petrol engine and electric motor. Terence has been driving a HEV for five years. He really doesn't understand why more people aren't accepting them. "I probably spend about $ 7 a day on petrol," "the taxi diver told news. com. au. In his previous conventional vehicle Terrence said he was spending up to $ 30 a day an petrol, meaning he saves almost $ 6000 every year.
The Toyota spokesman said this was quite a high saving and official tests estimate(估计)an average driver would only save about 33 percent off their current bill. This means a driver paying $ 30 a day on petrol would see their bill drop to about $ 20 using the hybrid. "A taxi driver that drives in built-up areas and spends little time on highways will notice a higher fuel saving," he said. "Low speeds allow the electric motors to be used more and the petrol engine used less."
While some people are skeptical about how reliable hybrids are, Terrence said he had never run out of power. His Camry cost about $ 34,000 and so after five years, it's nearly paid for itself. "For cab drivers, it's a real advantage because of the cost-effectiveness," he said. Terrence has no complaints about the car. "I love it, the calm and quietness of it, the simplicity of it-you just jump in and go. The maintenance is really low. But the only difficulty is finding someone to service the car as there are not many experienced mechanics.
Terrence said it's "extraordinary" that more drivers aren't buying more hybrid electric vehicles and that governments are not encouraging this more. "I think people have a view that you have to plug it in which is not true. A lack of information about the cars may he stopping people from taking the plunge. It's not promoted at all for the public to understand-it's simplifying the actual owning of a car-you don't have to do so many things to own it and run it, it's just so much simpler. Why wouldn't the government promote such a thing?
1. How much does an average drive save each day by driving a hybrid?A.$ 30 | B.$ 20 |
C.$ 10 | D.$ 7 |
A.speed | B.power |
C.price | D.service |
A.The difficulty in servicing the car. |
B.The restriction of the government. |
C.The lack of information about HEV. |
D.The inconvenience with charging the car. |
1. What can we infer from the first paragraph?
A.The Carnival of Brazil is often held after Easter. |
B.The Carnival of Brazil comes from Easter and Saturnalia. |
C.The Carnival of Brazil is mainly to celebrate the birth of Christ. |
D.The Carnival of Brazil is a festival to regret and begin a new life. |
A.About 100 years. | B.Less than two centuries. |
C.Over five centuries. | D.About 370 years. |
A.block parades become bigger and bigger. |
B.block parades can only be formed by big groups of revelers. |
C.the theme of blocks must be serious. |
D.blocks always parade only on the beach |
A.The famous carnivals in the world. |
B.How the carnival was introduced in Brazil. |
C.The happy life of the people in Rio de Janeiro. |
D.The carnival in Rio de Janeiro. |
Here are some advertisements about English language training from newspapers. You may find the information you need.
![](https://img.xkw.com/dksih/QBM/2014/7/25/1566916754096128/1566916756430848/STEM/12b52520638e4332a3cdde1f72750726.png)
1. What is special about the 2lst Century English Training Centre?
A.Its teaching quality is better. |
B.It is the nearest to the city center. |
C.Its courses are more advanced. |
D.It requires an entrance examination. |
A.Global English Center and Modern Language School. |
B.Global English Center and the International House of English. |
C.Modern Language School and the 2lst Century English Training Centre. |
D.The 2lst Century English Training Centre and the International House of English. |
A.67353019. | B.67705272. |
C.67801642. | D.67432308. |
【推荐2】Honeybees can’t swim, and when their wings are wet, they can’t fly, either. But Chris Roh and other researchers at the California Institute of Technology found that when bees drop into bodies of water, they can use their wings to produce little waves and slide toward land—like surfers who create and then ride their own waves.
As with many scientific advances-Isaac Newton’s apple or Benjamin Franklin’s lightning bolt—Dr. Roh’s experiment began with a walk. Passing Caltech’s Millikan Pond in 2016, he observed a bee on the water’s surface producing waves. He wondered how an insect known for flight could push itself through water.
Dr. Roh and his co-worker, Morteza Gharib, used butterfly nets to collect local Pasadena honeybees and observed their surf-like movements. The researchers used a wire to restrict each bee’s bodily movement, allowing close examination of their wings. They found that the bee bends its wings at a 30-degree angle, pulling up water and producing a forward force. Bees get trapped on the surface because water is roughly three times heavier than air. But that weight helps to push the bee forward when its wings move quickly up and down. It’s a tough exercise for the bees, which the researchers guess could handle about 10 minutes of the activity.
The researchers said the surf-like movement hasn’t been documented in other insects and most semiaquatic insects use their legs for propulsion, which is known as water-walking. It may have evolved in bees, they predicted.
Dr. Roh and Dr. Gharib have imagined many practical applications for bees’ surfing. One plan is to use their observations to design robots able to travel across sky and sea. “This could be useful for search and rescues, or for getting samples of the surface of the ocean, if you can’t send a boat or helicopter,” Dr. Gharib said.
1. What does the author intend to show by mentioning Newton and Franklin?A.Roh’s admiration for them. | B.Roh’s chance discovery about bees. |
C.Their outstanding talent for science. | D.Their similar achievements in discovery. |
A.The air weight. | B.Its leg extension. |
C.The water movement. | D.Its continuous wingbeat. |
A.Fast flight. | B.Driving force. | C.Pulling speed. | D.Explosive power. |
A.designing robots with the ability to travel across both sky and sea. |
B.Rescuing ships or saving sailors trapped in the ocean. |
C.Acquiring knowledge of moving samples of the surface of the ocean. |
D.Making helicopters in the shape of bees. |
A.Honeybees can surf to safety. | B.Bees help scientists make inventions. |
C.Insects can adapt to the environment. | D.Nature is a helpful guide for discovery. |
【推荐3】These days' experience, like many other things, are becoming increasingly expensive. One has to get to pay a lot to get, even an ordinary one.
Not long ago, I wanted to invite my friends to a lunch. What we really need was a good and a quiet place for a talk, not a big meal. So I chose one and told my friends to go there.
After I ordered, I was asked whether I would eat a 100 yuan or 200 yuan lunch, I said, "200 yuan." I didn't realize until I was asked to pay after lunch, that "200 yuan" means "200 yuan for person each."
There were five people that day, and all of us were surprises by the 200 yuan meal. The bill came at last: it was 1260, 1000 for the five of us, plus the money for drinks, fruits and air conditioning. I paid the bill without a word.
What could I say? It was not their fault. It was my own fault that made me pay the largest bill in my life.
However, it was not so bad: we had a good lunch and at a quiet place. Besides, the experience will help in my later years.
To support my idea, I have developed my own way of thinking about the price: 200 yuan for the lunch and 1260 for the experience. This paid experience has made me ten times wiser.
1. According to the passage , now one has to pay ________ .A.more for a lunch in a restaurant | B.more to get an ordinary lunch |
C.more for some experience | D.increasingly high price |
A.so as to have a big lunch | B.so that we could have a good meal |
C.in order to introduce my friends to the restaurant | D.to have a talk in a good place |
A.me 100 yuan | B.me 200 yuan |
C.us 200 yuan each | D.me 1260 yuan |
A.the restaurant cheated the customers | B.I was very rich |
C.I was unknown to the restaurant | D.I knew little about the market prices |
A.my thanks to the experience | B.my happiness to be 10 times wiser |
C.my anger at the experience | D.my pleasure to have a good lunch |