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 faults 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 has been raised about sunscreen and whether it may has 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.People with fair skin and freckles .
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A．seldom use sunscreen |
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B．are more in danger of skin cancer |
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C．can be free from the harm of the sun |
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D．often expose themselves to the sun |
2.We can learn from the passage that .
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A．sunscreen users get skin cancer more often |
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B．the volunteers have proved the effect of sunscreen |
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C．the new study was based on the experiences of volunteers |
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D．the number of skin cancer patients is increasing in America |
3.Which of the following can be the best title for this passage?
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A．Sunscreen to Prevent Skin Cancer |
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B．Sunscreen to Increase Skin Cancer |
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C．Skin Cancer Caused by Sunscreen |
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D．Skin Cancer Caused by Freckles |
On April 24th, another natural disaster—the oil spill(泄露) in the Gulf of Mexico, happened．Millions of dollars have been used to help stop the spill and to clean up the animals, beaches, and land spoiled by the oil．Unfortunately, when many of these chemicals are used, more damage is caused to the environment, especially to lives in the sea．
But governments seem to accept the risk of transporting millions of tons of oil by ship every day so that we can fill up our cars and drive around and cause even more environmental damage．Interestingly, the biggest companies in the world produce cars, and the next biggest supply the gasoline to make them run.
Of all of today's environmental disasters, an oil spill may actually be one of the least serious．Although oil is poisonous, it is a natural material．In the end, it breaks down naturally．In 1967 the tanker Torrey Canyon sank off the Scilly Isles near the coast of England and spilled 120,000 tons of oil into the ocean．If you go there today, you will find it hard to see any sign that it ever happened．
However, we should be thinking more about reducing our dependency on oil．Governments should be encouraging research into new technologies, such as cars run by solar power（太阳能）, electricity, hydrogen, and so on．Much of this research, in the past, was stopped by the oil, gas, and coal．
If the world's millions of cars were 10% more efficient（高效的）,we would need many fewer tankers crossing the oceans each year．If this happened, the risks of oil spills would be reduced, and the air we breathe would be cleaner and fresher, too．
1.What is the passage mainly talking about?
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A．Oil spills pollution． |
B．What oil pollution is． |
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C．Oil tanker accidents． |
D．How to reduce oil pollution. |
2.How does the author support the idea that oil spills are not as serious as people believe?
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A．By giving a description． |
B．By making an argument． |
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C．By giving an example． |
D．By comparing． |
3.Which suggestion is made for reducing oil tank accidents according to the passage?
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A．We should build safer tankers in the near future． |
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B．We should develop new technologies to cut oil use． |
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C．Tankers should not be allowed to sail near the coastlines． |
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D．Countries should build more oil pipelines under the sea． |
4.Where can you read this article?
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A．In a story book． |
B．In a science magazine． |
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C．In a novel． |
D．In a travel guide． |
This is the only way we can imagine him out of his foolish plan.
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A．persuading |
B．to persuade |
C．persuaded |
D．persuade |
It is difficult for us to conversation with all this noise around us.
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A．come up |
B．put up |
C．carry on |
D．get on |
The bank could us with $100,000 for the house．Why don't we buy it?
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A．show |
B．offer |
C．provide |
D．solve |
As days go on, I think that Beijing will become ______ the whole world pay close attention to.
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A．where |
B．what |
C．which |
D．that |
