Recently scientists have worked out a way to judge roughly where a person has lived using strands(缕) of hair, a technique that could help track the movements of criminal suspects or unidentified bodies .
The method depends on measuring how chemical variations in drinking water show up in people’s hair.
While U.S diet is relatively identical, water supplies vary. The differences result from weather patterns. The chemical composition of rainfall changes slightly as clouds move.
Most hydrogen and oxygen atoms in water are stable , but traces of both elements are also present as heavier isotopes (同位素) . The heaviest raid(列阵)falls first. As a result, storms that form over the Pacific deliver heavier water to California than to Utah.
Similar patterns exist throughout the U.S. By measuring the proportion of heavier hydrogen and oxygen isotopes along a strand of hair, scientists can establish a geographic timeline. Each inch of hair corresponds to about two months.
Cerling’s team collected tap water samples from 600 cities and constructed a frame of the regional differences. They checked the accuracy of the map by testing 200 hair samples collected from 65 barber shops. They were able to accurately place the hair samples in broad regions roughly corresponding to the movement of raid systems.
“It’s not good for pinpointing (精确定位),” he said. “It’s good for ruling out many possibilities.”
1.What can we learn from the passage about the latest discovery?
A. One’s hair growth has to do with the amount of water they drink.
B. A person’s hair may reveal where they have lived.
C. Hair analysis identifies criminal suspects accurately.
D. The chemical composition of hair varies from person to person.
2.What does the underlined word “identical” in paragraph 3 probably mean?
A. similar B. fantastic C. beneficial D. healthy
3.What is the practical value of Cerling’s research?
A. It helps analyze the quality of water in different regions.
B. It helps the police determine where a crime is committed.
C. It helps the police narrow down possibilities in detective work.
D. It helps identify the drinking habits of the person under investigation.
高三英语阅读理解中等难度题
Recently scientists have worked out a way to judge roughly where a person has lived using strands(缕) of hair, a technique that could help track the movements of criminal suspects or unidentified bodies .
The method depends on measuring how chemical variations in drinking water show up in people’s hair.
While U.S diet is relatively identical, water supplies vary. The differences result from weather patterns. The chemical composition of rainfall changes slightly as clouds move.
Most hydrogen and oxygen atoms in water are stable , but traces of both elements are also present as heavier isotopes (同位素) . The heaviest raid(列阵)falls first. As a result, storms that form over the Pacific deliver heavier water to California than to Utah.
Similar patterns exist throughout the U.S. By measuring the proportion of heavier hydrogen and oxygen isotopes along a strand of hair, scientists can establish a geographic timeline. Each inch of hair corresponds to about two months.
Cerling’s team collected tap water samples from 600 cities and constructed a frame of the regional differences. They checked the accuracy of the map by testing 200 hair samples collected from 65 barber shops. They were able to accurately place the hair samples in broad regions roughly corresponding to the movement of raid systems.
“It’s not good for pinpointing (精确定位),” he said. “It’s good for ruling out many possibilities.”
1.What can we learn from the passage about the latest discovery?
A. One’s hair growth has to do with the amount of water they drink.
B. A person’s hair may reveal where they have lived.
C. Hair analysis identifies criminal suspects accurately.
D. The chemical composition of hair varies from person to person.
2.What does the underlined word “identical” in paragraph 3 probably mean?
A. similar B. fantastic C. beneficial D. healthy
3.What is the practical value of Cerling’s research?
A. It helps analyze the quality of water in different regions.
B. It helps the police determine where a crime is committed.
C. It helps the police narrow down possibilities in detective work.
D. It helps identify the drinking habits of the person under investigation.
高三英语阅读理解中等难度题查看答案及解析
Scientists have devised a way to determine roughly where a person has lived using a strand (缕) of hair, a technique that could help track the movements of criminal suspects or unidentified murder victims.
The method relies on measuring how chemical variations in drinking water show up in people’s hair.
“You’re what you eat and drink, and that’s recorded in your hair,” said Thure Cerling, a geologist at the University of Utah.
While U.S diet is relatively identical, water supplies vary. The differences result from weather patterns. The chemical composition of rainfall changes slightly as rain clouds move.
Most hydrogen and oxygen atoms in water are stable, but traces of both elements are also present as heavier isotopes (同位素). The heaviest rain falls first. As a result, storms that form over the Pacific deliver heavier water to California than to Utah.
Similar patterns exist throughout the U.S. By measuring the proportion of heavier hydrogen and oxygen isotopes along a strand of hair, scientists can construct a geographic timeline. Each inch of hair corresponds to about two months.
Cerling’s team collected tap water samples from 600 cities and constructed a map of the regional differences. They checked the accuracy of the map by testing 200 hair samples collected from 65 barber shops. They were able to accurately place the hair samples in broad regions roughly corresponding to the movement of rain systems.
“It’s not good for pinpointing(精确定位),” Cerling said. “It’s good for eliminating many possibilities.”
Todd Park, a local detective, said the method has helped him learn more about an unidentified woman whose skeleton was found near Great Salt Lake.
The woman was 5 feet tall. Police recovered 26 bones, a T-shirt and several strands of hair.
When Park heard about the research, he gave the hair samples to the researchers.
Chemical testing showed that over the two years before her death, she moved about every two months.
She stayed in the Northwest, although the test could not be more specific than somewhere between eastern Oregon and western Wyoming.
“It’s still a substantial area,” Park said “But it narrows it way down for me.”
1.What is the scientists’ new discovery?
A. One’s hair growth has to do with the amount of water they drink.
B. A person’s hair may reveal where they have lived.
C. Hair analysis accurately identifies criminal suspects.
D. The chemical composition of hair varies from person to person.
2.What does the author mean by “You’re what you eat and drink” (Line 1, Para.3)?
A. Food and drink affect one’s personality development.
B. Food and drink preferences vary with individuals.
C. Food and drink leave traces in one’s body tissues.
D. Food and drink are essential to one’s existence.
3.What did Cerling’s team produce in their research?
A. A map showing the regional differences of tap water.
B. A collection of hair samples from various barber shops.
C. A method to measure the amount of water in human hair.
D. A chart illustrating the movement of the rain system.
4.What is the practical value of Cerling’s research?
A. It helps analyze the quality of water in different regions.
B. It helps the police determine where a crime is committed.
C. It helps the police narrow down possibilities in detective work.
D. It helps identify the drinking habits of the person under investigation.
高三英语阅读理解中等难度题查看答案及解析
– Sir, we have failed to work out this problem. What is exactly the right way?
--- Look. Only in this way ________ , but you boys _____ a wrong way.
A.you can work it out; take | B.you can work out it; take |
C.can you work it out; take | D.can you work it out; took |
高三英语单项填空中等难度题查看答案及解析
Recently, a group of scientists decided to find out what the funniest joke in the world was. This was obviously a difficult task, as no two people really agree about what is funny and what is not—especially when they are from different countries.
Here is the joke which the experts decided was the funniest joke in the world:
Two hunters were out in the woods. One of them fell to the ground. He didn’t seem to be breathing; his eyes were closed. The other hunter took out his mobile phone and called the emergency services.
“My friend is dead!” he cried to the operator. “What can I do?”The operator said,“Don’t worry. First, make sure he’s dead.” There was a silence, and then a shot was heard. Bang! The hunter’s voice came back on the line. He said, “OK, now what?”
This is perhaps amusing. Culturally, it depends on us knowing that often hunters are not considered to be very intelligent people, and that often they are quite violent. But perhaps this is not so all over the world. It’s also quite a “black” joke—a joke about something which isn’t really a funny subject. The experts also found the second funniest joke in the world. Here it is:
Sherlock Holmes and Dr. Watson went on a camping trip. After dinner, they went to sleep. Some hours later, Holmes woke up. “Watson, look up at the sky and tell me what you see.” “I see millions of stars, Holmes,” replied Watson.
“And what do you infer from that? ”
“Well, there are billions of stars ... we are a small part of the universe ...”
“Watson, you idiot!” he said. “Someone has stolen our tent!” I personally think this is better.
Can scientists in the end decide what is funny? Some things are much too complicated, even for scientists.
1.What can we learn from the first paragraph?
A.Few jokes can make scientists laugh.
B.Only scientists can find out the funniest joke.
C.There are different jokes in different countries.
D.People hold different opinions about what is funny.
2.What does the author think of the first joke?
A.It is not so funny as the experts thought.
B.It is really the funniest joke he has ever heard.
C.It can greatly affect readers’ attitudes toward hunters.
D.It shows that not all hunters are brave and intelligent.
3.We can learn that a person’s understanding of a joke can be affected by ________.
A.the reader’s feeling B.the length of the joke
C.the reader’s cultural background D.the language that the teller uses
4.Which of the following is the best title for this passage?
A.Uninteresting jokes B.Different kinds of jokes
C.The funniest jokes in the world D.Tips on how to make others laugh
高三英语阅读理解中等难度题查看答案及解析
Elephants have their own way to tell the shape of an object and ________ it is rough or smooth .
A. 不填 B. whether C. how D. what
高三英语单项填空中等难度题查看答案及解析
Elephants have their own way to tell the shape of an object and _________ it is rough or smooth.
A.不填 B.whether C.how D.what
高三英语单项填空简单题查看答案及解析
Elephants have their own way to tell the shape of an object and _________ it is rough or smooth.
A.不填 B.whether C.how D.what
高三英语单项填空中等难度题查看答案及解析
Recently some American scientists have a useful piece of advice to people in industrialized nations. They say people should eat more of the same kind of food eaten by humans living more than 10, 000 years ago.1.
The scientists say that the human life has changed greatly. Our bodies have not been able to deal with these changes in lifestyle and this has led to new kinds of sicknesses. These new sicknesses were not known in ancient times.So they are called “diseases of civilization”. 2.
Scientists noted that people in both the Old Stone Age and the New Stone Age enjoyed very little alcohol or tobacco, probably none.3. However, a change in food is one of the main differences between life in ancient times and that of today.
Stone Age people hunted wild animals for their meat, which had much less fat than domestic ones. They ate a lot of fresh wild vegetables and fruits. They did not have milk or any other dairy products, and they made very little use of grains.4.We eat six times more salt than our ancestors. We eat more sugar. We eat twice as much fat but only one third as much protein and much less vitamin C.
5. But scientists say that we would be much healthier if we eat much the same way the ancient people did, cutting the amount of fatty, salty and sweet food.
A. People today probably don’t want to live like our ancestors.
B. Ancient people also got lots of physical exercise.
C. Stone Age people lived a simple life.
D. Many cancers and diseases of the blood system are examples of such diseases.
E. Modern people used to suffer from “diseases of civilization.”
F. But today, we enjoy eating a lot of these.
G. In that case, they would live much healthier.
高三英语短文填空中等难度题查看答案及解析
Recently, researchers at the University of Toronto figured out a way with a quick video selfie to accurately measure blood pressure with your smartphone’s camera by developing a technology known as transdermal optical imaging (TOI)(透皮光学成像).
Cameras on smartphones can catch red light reflected from hemoglobin (血红素)under our skin, which permits TOI to visualize and measure blood flow changes. Researchers measured the blood pressure of 1,328 Canadian and Chinese adults by getting two-minute videos of their faces on an iPhone. “From the video got by the technology, you can see how the blood flows in different parts of the face and through this flow, you can get a lot of information,” said Kang Lee, lead author of the study.
Lee also helped create an app called Anura, which allows people to try out the TOI software for themselves, giving them the ability to record a 30-second video of their face and receive measurements for stress levels and resting heart rate. Lee said more research was needed to make sure that the measurements were as accurate as possible, explaining that the study didn’t test people with very dark or very fair skin.
“In order to improve our app to make it usable, particularly for people with hypertension (高血压),we need to collect a lot of data from them, which is very hard because a lot of them are already taking medicine,” Lee explained. “We cannot tell them not to take medicine, but from time to time, we get participants who don’t take medicine so we can get hypertensive people this way.”
The scientists said there were many potential applications of the technology, including providing health services for those who lived in remote areas.
1.What is mainly talked about in Paragraph 2?
A.Information offered by TOI. B.New findings on hypertension.
C.How TOI is put into smart phones. D.How the TOI technology works.
2.What might people benefit from the new technology mentioned above?
A.Living a life free from stress. B.Improving the heart function gradually.
C.Accessing health services for free. D.Knowing abnormal blood pressure earlier.
3.What can be done for a better Anura?
A.Equipping phones with better cameras.
B.Allowing phones to record longer videos.
C.Collecting data from more diverse samples.
D.Persuading participants not to take medicine.
4.Why does the author write this text?
A.To predict future applications of TOI.
B.To introduce TOI and an app related.
C.To describe functions of cameras on phones.
D.To evaluate the quality of an app called Anura.
高三英语阅读理解困难题查看答案及解析
It's hair-raising news for criminals on the run. Scientists behind a new study have worked out how to identify individuals only based on the proteins(蛋白质) in a single piece of their hair.
While the police already look at DNA from hair as part of investigations, the technique is far from ideal: DNA is easily changeable, meaning it can only be analyzed within a certain time period after the crime. But the new technique could even be used to solve historical or archaeological cases, making it far superior to DNA arrangement in many ways.
DNA change depends on several environmental factors including temperature, humidity and PH. It is also affected by the activity of bacteria and other microorganisms. In contrast, actual hairs can survive for a long time-----sometimes centuries. After bones and teeth, hair is in fact one of the most resistant structures of the human body.
In order to understand how the protein can be used to identify individuals, it is important to understand proteins are coded by DNA. This means that a certain level of the genetic variation that we see in different people's DNA passes into their proteins. In fact, genetic information in the DNA is translated into chains that make up proteins.
The method not only allows for human identification but it can also show how old the sample is and what region it comes from, so that we can distinguish between current and ancient samples. But while the discovery is exciting, the technique is not quite polished enough to be used in the court room. The main task now will be to analyze hair samples from all over the world, which will make it a lot more reliable.
The new discovery will promote the significance of hair as evidence in courts, at a time when some forensic(司法鉴定的) disciplines have been criticized in the US. It will also be of great use in archaeology.
1.What's the main idea of the passage?
A. DNA evidence is far from ideal.
B. Criminals on the run get hair-raising news.
C. Scientists are planning a test of human hair.
D. Humans can be identified by proteins in hair.
2.Which evidence is more reliable for the police to identify a criminal?
A. Lost teeth B. The footprint.
C. Personal belongings D. Damaged DNA.
3.In what way is the new technique superior to DNA test?
A. Serving as evidence in courts.
B. Possessing genetic information.
C. Inferring the height of a person.
D. Distinguishing the region of a person.
4.What will scientists do in the following few years?
A. Test hair samples worldwide. B. Legalize the hair evidence.
C. Apply protein-test to archaeology. D. Map the structure of DNA.
5.Who will welcome the discovery?
A. Criminals. B. Employers.
C. Hairdressers. D. Archaeologists.
高三英语阅读理解中等难度题查看答案及解析