Clinical evidence began to ______,suggesting ...

Clinical evidence began to ______,suggesting that the new drugs had a wider range of useful activities than had been predicted from experiments in animals.

A. operate　　　　　 B. strengthen

C. approve　　　　 D. accumulate

高三英语单项填空中等难度题查看答案及解析

Clinical evidence began to__________, suggesting that the new drugs had a wider range of useful activities than had been predicted from experiments in animals.

A. operate          B. straighter         C. approve         D. accumulate

高三英语单项填空中等难度题查看答案及解析

Coffee is one of the world's most widely-enjoyed drinks. Now, a new research suggests that if you drink enough coffee, it might help you avoid certain kinds of cancer.

Dr. Mia Hashibe of the University of Utah School of Medicine was interested in the connection between coffee drinking and certain cancers of the head and neck. Researchers have looked into this before, but without reaching any firm conclusions. She said, "So this finding from our new study was quite a surprise. We didn't really have any expectation of which direction it could go into."

To sort out the confusion, Hashibe and her assistants used statistical (统计学 ) techniques to, in effect, make one big study out of the earlier smaller studies. She explained,  "Thanks to the earlier studies, we have a lot more power than earlier studies that looked at this. And we included 4,000 cancer patients who have cancer of the mouth and throat. And then 9,000 controls, people who do not have cancer. '

Those studies--in Europe and the United States--found that people who drank a lot of coffee were less likely to develop cancers of the mouth and throat. "We saw a protective effect for drinking more than 4 cups of coffee per day," Hashibe said. "This was the 40 percent decrease in risk. We did not see the same effect for drinking three cups or less per day."

Mia Hashibe said there was a weak connection between cancer risk and drinking coffee without caffeine. And she and her assistants found no proof that drinking tea provided the same protection as drinking Coffee. Their research is published in the journal Cancer Epidemiology, Biomarkers & Prevention.

Hashibe says it is not clear how coffee might protect drinkers from certain cancers. "There are a few chemicals that are known to be antioxidants （抗氧化物）in coffee. So we are thinking perhaps they are playing some sort of protective role against several cancers."

1.This passage is probably taken from __

A. a literature book                          B. a travel journal

C. an old directory                       D. a medical magazine

2.Dr. Hashibe expected nothing of her research because __

A. it was impossible to get the desired result   B. the research was much surprising in fact

C. no conclusions had been reached before    D. the research team lacked faith in success

3.Which of the following might have something to do with the protection against mouth cancer?

A. Coffee without chemicals.                   B. Coffee without caffeine.

C. Four cups of tea a day.                 D. Antioxidants in coffee.

4.What do we know about Dr. Mia Hashibe and her research?

A. She knew for sure how coffee may affect drinkers.

B. She included 4,000 people without cancer in study.

C. She found an effect for three cups of coffee a day.

D. She based her research on several earlier studies.

5.What would be the best title for the text?

A. Drinking Coffee May Protect Some Cancers     B. Drinking Coffee May Prevent Some Cancers

C. Drinking Coffee May Cure Some Caneers       D. Drinking Coffee May Cause Some Cancers

高三英语阅读理解中等难度题查看答案及解析

Fresh evidence has recently _________ which suggests that he did not commit the murder.

高三英语单项填空简单题查看答案及解析

Young sunflowers turn and swing every day. New findings add to evidence that the plants are animal-like.

Harmer, a professor in the University of California at Davis’ Department of Plant Biology, carried out a series of experiments on sunflowers in the field, in pots outdoors and in indoor growth chambers.

By staking plants so that they could not move, Harmer showed that he could destroy their ability to track the sun. He also noticed that sunflowers prevented from moving were not as tough and leafy as those that were free to move. When plants were moved indoor with a settled overhead light, they continued to swing back and forth for a few days.

The indoor plants did start tracking the “sun” again when the apparent source of lighting was moved across the room. The plants could reliably track the movement and return at night when the artificial day was close to a 24-hour cycle, but not when it was closer to 30 hours.

When sunflowers track the sun, the east sides of their stems grew more rapidly than the west sides. At night, the west sides grew faster as the stem swung the other way. The team identified a number of genes that were expressed at higher levels on the sunward side of the plant during the day, or on the other side at night. A plant growth-regulating hormone, called auxin, appears to be a key driver.

The “dance” to the sun cycle obviously slows when the sunflower matures and its flowers open up. At that point, the plants stop moving during the day and settle down facing the sun in the east.

“Bees like warm flowers.” Harmer said, adding that the bees are cold-blooded, so landing on a warm flower saves them energy and perhaps feels really good.

“The morning warmth changes the flowers in a way to make them more appealing to insects, perhaps causing them to release more attractive scents earlier in the day.” he said. “We’re currently testing this idea.”

1.Why did Harmer do the experiment on sunflowers?

A.To see how sunflowers grow up.

B.To show what sunflowers’ genes are.

C.To study why sunflowers track the sun.

D.To check if sunflowers swing in cloudy days.

2.What does the underlined word “staking”(Par 3) probably mean in ?

A.Tracking. B.Fastening.

C.Preserving. D.Presenting.

3.What is the result of sunflowers being stopped from moving?

A.They won’t grow well.

B.They will grow faster than usual.

C.They won’t swing back though set free.

D.They will produce a number of new genes.

4.What would happen to the sunflowers if they became fully grown?

A.They would swing as usual.

B.They would move back and forth.

C.They would stop turning.

D.They would track the sun.

5.Bees are fond of dancing ______________.

A.on cold sunflowers B.in the circle of flowers

C.on warm sunflowers D.on the mature sunflowers

高三英语阅读理解中等难度题查看答案及解析

Young sunflowers turn and swing every day. New findings add to evidence that the plants are animal-like.

Harmer, a professor in the University of California at Davis, Department of Plant Biology, carried out a series of experiments on sunflowers in the field, in pots outdoors and in indoor growth chambers.

By staking plants so that they could not move, Harmer showed that he could destroy their ability to track the sun. He also noticed that sunflowers prevented from moving were not as tough and leafy as those that were free to move. When plants were moved indoor with a settled overhead light, they continued to swing back and forth for a few days.

The indoor plants did start tracking the “sun” again when the apparent source of lighting was moved across the room. The plants could reliably track the movement and return at night when the artificial day was close to a 24-hour cycle, but not when it was closer to 30 hours.

When sunflowers track the sun, the east sides of their stems grew more rapidly than the west sides. At night, the west sides grew faster as the stem swung the other way. The team identified a number of genes that were expressed at higher levels on the sunward side of the plant during the day or on the other side at night. A plant growth-regulating hormone (激素), called auxin, appears to be a key driver.

The “dance” to the sun cycle obviously slows when the sunflower matures (成熟) and its flowers open up. At that point, the plants stop moving during the day and settle down facing the sun in the east.

“Bees like warm flowers.” Harmer said, adding that the bees are cold-blooded, so landing on a warm flower saves them energy and perhaps feels really good.

“The morning warmth changes the flowers in a way to make them more appealing to insects, perhaps causing them to release more attractive scents earlier in the day.” he said “We’re currently testing this idea.”

1.Why did Harmer do the experiment on sunflowers?

A.To see how sunflowers grow up.

B.To show what sunflowers’ genes are.

C.To study why sunflowers track the sun.

D.To check if sunflowers swing in cloudy days.

2.What does the underlined word “staking” probably mean in Paragraph 3?

A.Tracking. B.Fining.

C.Growing. D.Searching.

3.What is the result of sunflowers being stopped from moving?

A.They will produce a number of new genes.

B.They will grow faster than usual.

C.They won’t swing back though set free.

D.They won’t grow well.

4.What is the advantage of sunflowers’ dance to the sun?

A.They attract more insects. B.They save more energy.

C.They mature more rapidly. D.They produce more flowers.

高三英语阅读理解中等难度题查看答案及解析

Young sunflowers turn and swing every day. New findings add to evidence that the plants are animal-like.

Harmer, a professor in the University of California at Davis’ Department of Plant Biology, carried out a series of experiments on sunflowers in the field, in pots outdoors and in indoor growth chambers.

By staking plants so that they could not move, Harmer showed that he could destroy their ability to track the sun. He also noticed that sunflowers prevented from moving were not as tough and leafy as those that were free to move. When plants were moved indoor with a settled overhead light, they continued to swing back and forth for a few days.

The indoor plants did start tracking the “sun” again when the apparent source of lighting was moved across the room. The plants could reliably track the movement and return at night when the artificial day was close to a 24-hour cycle, but not when it was closer to 30 hours.

When sunflowers track the sun, the cast sides of their stems grew more rapidly than the west sides. Ai night, the west sides grew faster as the stem swung the other way. The team identified a number of genes that were expressed at higher levels on the sunward side of the plant during the day, or on the other side at night. A plant growth-regulating hormone, called auxin, appears to be a key driver.

The “dance” to the sun cycle obviously slows when the sunflower matures and its flowers open up. At that point, the plants stop moving during the day and settle down facing the sun in the east.

“Bees like warm flowers.” Harmer said, adding that the bees are cold-blooded, so landing on a warm flower saves them energy and perhaps feels really good.

“The morning warmth changes the flowers in a way to make them more appealing to insects, perhaps causing them to release more attractive scents earlier in the day.” he said. “We’re currently testing this idea.”

1.Why did Harmer do the experiment on sunflowers?

A.To see how sunflowers grow up.

B.To show what sunflowers’ genes are.

C.To study why sunflowers track the sun.

D.To check if sunflowers swing in cloudy days.

2.What does the underlined word “slaking” probably mean in Paragraph 3?

A.Tracking. B.Fastening.

C.Preserving. D.Researching.

3.What is the result of sunflowers being stopped from moving?

A.They won’t grow well.

B.They will grow faster than usual.

C.They won’t swing back though set free.

D.They will produce a number of new genes.

4.What is the advantage of sunflowers’ dance to the sun?

A.They attract more insects. B.They save more energy.

C.They mature more rapidly. D.They produce more flowers.

高三英语阅读理解困难题查看答案及解析

Young sunflowers turn and swing every day. New findings add to evidence that the plants are animal-like.

Harmer, a professor in the University of California at Davis, Department of Plant Biology, carried out a series of experiments on sunflowers in the field, in pots outdoors and in indoor growth chambers.

By staking plants so that they could not move, Harmer showed that he could destroy their ability to track the sun. He also noticed that sunflowers prevented from moving were not as tough and leafy as those that were free to move. When plants were moved indoor with a settled overhead light, they continued to swing back and forth for a few days.

The indoor plants did start tracking the “sun” again when the apparent source of lighting was moved across the room. The plants could reliably track the movement and return at night when the artificial day was close to a 24-hour cycle, but not when it was closer to 30 hours.

When sunflowers track the sun, the east sides of their stems grew more rapidly than the west sides. At night, the west sides grew faster as the stem swung the other way. The team identified a number of genes that were expressed at higher levels on the sunward side of the plant during the day or on the other side at night. A plant growth-regulating hormone (激素), called auxin, appears to be a key driver.

The “dance” to the sun cycle obviously slows when the sunflower matures (成熟) and its flowers open up. At that point, the plants stop moving during the day and settle down facing the sun in the east.

“Bees like warm flowers.” Harmer said, adding that the bees are cold-blooded, so landing on a warm flower saves them energy and perhaps feels really good.

“The morning warmth changes the flowers in a way to make them more appealing to insects, perhaps causing them to release more attractive scents earlier in the day.” he said “We’re currently testing this idea.”

1.Why did Harmer do the experiment on sunflowers?

A. To see how sunflowers grow up

B. To show what sunflowers’ genes are.

C. To study why sunflowers track the sun.

D. To check if sunflowers swing in cloudy days.

2.What does the underlined word “staking” probably mean in Paragraph 3?

A. tracking　　 B. fining

C. growing　　 D. searching

3.What is the result of sunflowers being stopped from moving?

A. They will produce a number of new genes.

B. They will grow faster than usual.

C. They won’t swing back though set free.

D. They won’t grow well.

4.What is the advantage of sunflowers’ dance to the sun?

A. They attract more insects.　　 B. They save more energy.

C. They mature more rapidly.　　 D. They produce more flowers.

高三英语阅读理解中等难度题查看答案及解析

Young sunflowers turn and swing every day. New findings add to evidence that the plants are animal-like.

Harmer, a professor in the University of California at Davis’ Department of Plant Biology, carried out a series of experiments on sunflowers in the field, in pots outdoors and in indoor growth chambers.

By staking plants so that they could not move, Harmer showed that he could destroy their ability to track the sun. He also noticed that sunflowers prevented from moving were not as tough and leafy as those that were free to move. When plants were moved indoor with a settled overhead light, they continued to swing back and forth for a few days.

The indoor plants did start tracking the “sun” again when the apparent source of lighting was moved across the room. The plants could reliably track the movement and return at night when the artificial day was close to a 24-hour cycle, but not when it was closer to 30 hours.

When sunflowers track the sun, the cast sides of their stems grew more rapidly than the west sides. Ai night, the west sides grew faster as the stem swung the other way. The team identified a number of genes that were expressed at higher levels on the sunward side of the plant during the day, or on the other side at night. A plant growth-regulating hormone, called auxin, appears to be a key driver.

The “dance” to the sun cycle obviously slows when the sunflower matures and its flowers open up. At that point, the plants stop moving during the day and settle down facing the sun in the east.

“Bees like warm flowers.” Harmer said, adding that the bees are cold-blooded, so landing on a warm flower saves them energy and perhaps feels really good.

“The morning warmth changes the flowers in a way to make them more appealing to insects, perhaps causing them to release more attractive scents earlier in the day.” he said. “We’re currently testing this idea.”

1.Why did Harmer do the experiment on sunflowers?

A. To see how sunflowers grow up.

B. To show what sunflowers’ genes are.

C. To study why sunflowers track the sun.

D. To check if sunflowers swing in cloudy days.

2.What does the underlined word “slaking” probably mean in Paragraph 3?

A. Tracking.　　 B. Fastening.

C. Preserving.　　 D. Researching.

3.What is the result of sunflowers being stopped from moving?

A. They won’t grow well.

B. They will grow faster than usual.

C. They won’t swing back though set free.

D. They will produce a number of new genes.

4.What is the advantage of sunflowers’ dance to the sun?

A. They attract more insects.　　 B. They save more energy.

C. They mature more rapidly.　　 D. They produce more flowers.

高三英语阅读理解困难题查看答案及解析

A new study has found no evidence that sunscreen, commonly used to reduce the risk of skin cancer, actually increases the risk.

Researchers from the University of Iowa based their findings on a review of 18 earlier studies that looked at the association between sunscreen use and melanoma(黑素瘤). They said that they found flaws in studies that had reported associations between sunscreen use and higher risk of melanoma.

Most health experts believe that by protecting the skin from the harmful effects of the sun, sunscreen helps prevent skin cancer, which is increasing in incidence(发生率)faster than any other cancer in the United States.

But questions have been raised about sunscreen and whether it may have the opposite effect, perhaps by allowing people to remain exposed to the sun longer without burning.

The researchers said that among the problems with some earlier studies is that they often failed to take into account that those people most at risk for skin cancer—people with fair skin and freckles(雀斑), for example—are more likely to use sunscreen. As a result, it may appear that sunscreen users get cancer more often.

The studies, which generally relied on volunteers to recall their sunscreen use, were also unable to prove how well the products had been applied, said the new study.

1.The underlined word “flaws” in the 2nd paragraph most probably means 　　　　 .

A. evidences        B. facts        C. faults        　　 D. failures

2.People with fair skin and freckles 　　　　　 .

A. seldom use sunscreen            　　　　

B. are more in danger of skin cancer

C. can be free from the harm of the sun    　

D. often expose themselves to the sun

3.We can learn from the passage that 　　　　　 .

A. sunscreen users get skin cancer more often

B. the volunteers have proved the effect of sunscreen

C. the new study was based on the experiences of volunteers

D. the number of skin cancer patients is increasing in America

4.Which of the following can be the best title for this passage?

A. Sunscreen to Prevent Skin Cancer    　　

B. Sunscreen to Increase Skin Cancer

C. Skin Cancer Caused by Sunscreen    　　

D. Skin Cancer Caused by Freckles

高三英语阅读理解中等难度题查看答案及解析