In a society where lung and breast cancers are leading causes of cancer death worldwide, early detection of the disease is highly desirable. In a new scientific study, researchers present astonishing 题目和参考答案——青夏教育精英家教网—

题目内容

In a society where lung and breast cancers are leading causes of cancer death worldwide, early detection of the disease is highly desirable. In a new scientific study, researchers present astonishing new evidence that man's best friend, the dog, may have the ability to contribute to early cancer detection.

Researchers show scientific evidence that a dog’s extraordinary smelling ability can distinguish people with both early and late stage lung and breast cancers from healthy people. Researchers first discovered this in the case report of a dog warning its owner to the presence of a melanoma (恶性黑素瘤) by constantly sniffing the skin lesion (损伤). Later studies published in major medical magazines proved the ability of trained dogs to detect both melanomas and bladder cancers. The new study is the first to test whether dogs can detect cancers only by sniffing the breath of cancer patients.

In this study, five household dogs were trained within a short 3-week period to detect lung or breast cancer by sniffing the breath of cancer patients. The experiment consisted of 86 cancer patients (55 with lung cancer and 31 with breast cancer) and 83 healthy people. All cancer patients had recently been diagnosed with cancer and had not yet undergone any chemotherapy treatment (化疗). The dogs were presented with breath samples from the cancer patients and the healthy ones, captured in a special tube. Dogs were trained to give a positive identification of a cancer patient by sitting or lying down directly in front of a test station containing a cancer patient sample, while ignoring healthy samples.

The results of the study showed that dogs can detect breast and lung cancer between 88% and 97%. Moreover, the study also proved that the trained dogs could even detect the early stages of lung cancer, as well as early breast cancer. The researchers concluded that breath analysis might become a potential of cancer diagnosis.

56. What's the best title of the passage?

A. Can dogs smell cancer? B. Dogs and treatment

C. A new research on breast cancer D. An interesting experiment on lung cancer

57. In this scientific study, five household dogs, _____lung cancer patients and healthy people are involved.

A. 86; 88 B. 31; 97 C. 55; 83 D. 86; 83

58. The last sentence of the passage means .

A. doctors won’t be worried about detecting cancers any more

B. dogs will be the only way to detect cancers

C. breath analysis can be used in diagnosing cancers in the future

D. dogs can use its smell to identify people

59. The research found that dogs could help detect cancers by_______.

A. being captured in a special tube

B. sniffing the skin lesion

C. sniffing the breath of the cancer patients

D. sitting or lying down before a cancer patient

ACCC

练习册系列答案

课课练与单元测试系列答案

世纪金榜小博士单元期末一卷通系列答案

单元测试AB卷台海出版社系列答案

黄冈新思维培优考王单元加期末卷系列答案

相关题目

Language is always changing. In a society where life continues year after year with few changes, the language does not change, either. The earliest known languages had difficult grammar but a small, limited vocabulary. Over the century, the grammar changed, and the vocabulary grew. For example, the English and Spanish people who came to America during the sixteenth century gave names to all new plants and animals they found. In this way, hundreds of new words were introduced into English and Spanish vocabularies. Today life is changing very fast, and language is changing fast too.
There are several major language families in the world. Some scientists say there are nine main families, but other scientists divide them differently. The languages in each family are connected, and scientists think that they came from the same parent language About 3 percent of the people in the world speak languages that are not in these major families.
【小题1】 The early language had ______.

A．a lot of problems	B．words and easy grammar
C．words but no grammar	D．grammar but not many words

【小题2】In the next few hundred years we can expect language to ______.

A．stay exactly the same	B．change a great deal
C．change only a little	D．add more words and drop some grammar

【小题3】What this article shows is that ______.

A．languages change fast	B．languages really don’t want to change
C．language changes with changes of society	D．Spanish and English change

【小题4】 From this article we can see that ______.

A．language can change very slowly or very quickly

B．Though our life changes, our language won’t change.

C．we should give our plants new names

D．English and Spanish are the only languages that have changes

The young boy saw me, or rather, he saw the car and quickly ran up to me, eager to sell his bunches of bananas and bags of peanuts. Though he appeared to be about twelve, he seemed to have already known the bitterness of life. “Bananas 300 naira. Peanuts 200 naira.” He said in a low voice. I bargained him down to 200 totals for the fruit and nuts. When he agreed, I handed him a 500 naira bill. He didn’t have change, so I told him not to worry. He said thanks and smiled a row of perfect teeth.
When, two weeks later, I saw the boy again, I was more aware of my position in a society where it’s not that uncommon to see a little boy who should be in school standing on the corner selling fruit in the burning sun. My parents had raised me to be aware of the advantage we had been afforded and the responsibility it brought to us.
I pulled over and rolled down my window. He had a bunch of bananas and a bag of peanuts ready. I waved them away. “What’s up?” I asked him.
“I…I don’t have money to buy books for school.” I reached into my pocket and handed him two fresh 500 naira bills. “Will this help?” I asked. He looked around nervously before taking the money. One thousand naira was a lot of money to someone whose family probably made about 5,000 naira or less each year. “Thank you, sir.” he said. “Thank you very much!”
When driving home, I wondered if my little friend actually used the money for schoolbooks. What if he’s a cheat? And then I wondered why I did it. Did I do it to make myself feel better? Was I using him? Later, I realized that I didn’t know his name or the least bit about him, nor did I think to ask.
Over the next six months, I was busy working in a news agency in northern Nigeria. Sometime after I returned, I went out for a drive. When I was about to pull over, the boy suddenly appeared by my window with a big smile ready on his face.
“Oh, gosh! Long time.”
“Are you in school now?” I asked.
He nodded.
“That’s good,” I said. A silence fell as we looked at each other, and then I realized what he wanted. “Here,” I held out a 500 naira bill. “Take this.” He shook his head and stepped back as if hurt. “What’s wrong?” I asked. “It’s a gift.”
He shook his head again and brought his hand from behind his back. His face shone with sweat. He dropped a bunch of bananas and a bag of peanuts in the front seat before he said, “I’ve been waiting to give these to you.”
【小题1】What was the author’s first impression of the boy?

A．He seemed to be poor and greedy.

B．He seemed to have suffered a lot.

C．He seemed younger than his age.

D．He seemed good at bargaining.

【小题2】The second time the author met the boy, the boy ______.

A．told him his purpose of selling fruit and nuts

B．wanted to express his thanks

C．asked him for money for his schoolbooks

D．tried to take advantage of him

【小题3】Why did the author give his money to the boy?

A．Because he had enough money to do that.

B．Because he had learnt to help others since childhood.

C．Because he held a higher position in the society.

D．Because he had been asked by the news agency to do so.

【小题4】Which of the following best describes the boy?

A．Brave and polite.	B．Kind and smart.
C．Honest and thankful.	D．Shy and nervous.

Directions: Read the following passage．Fill in the numbered blanks by using the information from the passage．Write NO MORE THAN THREE WORDS for each answer．
In a society such as the United States or Canada, which has many national, religious and cultural differences, people highly value individualism—the differences among people. Teachers place a lot of importance on the qualities that make each student special. The educational systems in these countries show these values. Students do not memorize information. Instead, they work on their own and find answers themselves. There is often a discussion in the classroom. At an early age, students learn to form their own ideas and opinions.
In most Asian societies, by contrast, people have the same language, history and culture. Perhaps for this reason, the educational system in these Asian countries reflects society’s belief in group goals and purposes rather than individualism. Children in China, Japan and Korea often work together and help one another on assignments.
There are advantages and disadvantages to both of these systems of education. For example, one advantage of the system in Japan is that students there learn much more maths and science than American students learn by the end of high school. They also study more hours each day and more days each year than North Americans do. The system is difficult, but it prepares students for a society that values discipline and self-control. There is, however, a disadvantage. Memorization is an important learning method in Japanese schools, but many students say that after an exam, they forget much of the information they have memorized.
The advantage of educational system in North America, on the other hand, is that students learn to think for themselves. The system prepares them for a society that values creative ideas. There is, however, a disadvantage. When students graduate from high school, they haven’t memorized as much basic rules as students in other countries have.
Title: A comparison of two different educational systems

71__________	Features of education	72 __________	Disadvantage
The United States and Canada	● 73__________ ●emphasizing qualit- -ies making each student special	●learning to 74 ________ ●preparing them for a society valuing creative ideas	75 ________
Asian countries such as China, 76__________	● 77__________ in group goals and purposes	●learning much more 78______ than American students do ●studying more hours each day and more days each year ●preparing students for a society valuing 79________	forgetting much of 80_______

As we all know, language is always changing. In a society where life continues year after year with few changes, the language does not change either. The earliest known languages had difficult grammar but a small, limited vocabulary. Over the century, the grammar changed, and the vocabulary grew. For example, the English and Spanish people who came to America during the sixteenth century gave names to all the new plants and animals they found. In this way, hundreds of new words were introduced into English and Spanish vocabularies. Today life is changing very fast, and language is changing fast too.

There are several major(主要) language families in the world. Some scientists say there are nine main families, but other scientists divide them differently. The languages in each family are connected, and scientists think that they came from the same parent language. About 3 percent of the people in the world speak languages that are not in these major families.

1.The early language had ________.

A．a lot of problems

B．words and easy grammar

C．words but no grammar

D．grammar but not many words

2.In the next few hundred years we can expect language to _____.

A．stay exactly the same

B．change a great deal

C．change only a little

D．ask more words and drop some grammar

3.What this article shows is that _____.

A．languages change fast

B．languages really don't want to change

C．language really with changes in society

D．Spanish and English change

Language is always changing. In a society where life continues year after year with few changes, the language does not change either. The earliest known languages had difficult grammar but a small, limited vocabulary. Over the century, the grammar changed, and the vocabulary grew. For example, the English and Spanish people who came to America during the sixteenth century gave names to all the new plants and animals they found. In this way, hundreds of new words were introduced into English and Spanish vocabularies. Today life is changing very fast, and language is changing fast too.