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发表于 2016-7-4 04:48:35
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Researchers have announced the result of two studies on the health effects of the drug aspirin. One study shows aspirin can sharply reduce the chance that a healthy, older man will suffer from a heart attack.
The study offered two new results from earlier findings. It said taking one aspirin pill every other day helped only healthy men over the age of fifty. It also said aspirin gave the greatest protection against heart attacks to men with low blood cholesterol (胆固醇) levels.
Earlier in the United States began a major aspirin study in the early 1980s. It included 22,000 healthy men doctors. All were between the ages of forty and eighty-four. More than 11,000 of the doctors took a harmless pill that contained no drug. The men did not know which kind of pill they were taking.
The doctors who took aspirin suffered 44% fewer heart attacks than those taking the harmless pill. 139 men who took aspirin suffered from heart attacks. Ten of them died. 239 men who did not take aspirin suffered from heart attacks. Twenty-six of them died.
The researchers said the doctors' study provides clear proof that taking aspirin can prevent a first heart attack in healthy, older men. They said, however, the result does not mean every man over the age of fifty should take aspirin. They said aspirin couldn't help men who do not eat healthy foods, who smoke cigarettes and who are fat. The researchers said men who think they would be helped by taking aspirin should talk with their doctors first.
64. The passage tells us that the new use of aspirin is ______.
A. to treat heart disease
B. to reduce pain while one suffers from a heart attack
C. to help old people to be more healthy
D. to reduce the chance of a heart attack in old men
65. Aspirin can help those who ______.
A. work as doctors B. are under 40 years old
C. are fat and smoke cigarettes D. are older and healthy
66. At last the researchers advised us to take aspirin ______.
A. with care B. as much as we like
C. every day D. only considering the age
67. From the experiment we can conclude that about _____ of people who suffered from heart attacks without aspirin died.
A. 7% B. 11% C. 19% D. 44%
D
A latest national survey has found that over half of China's netizens（网民）are suffering from various mental problems although some 62 percent of them claim at the same time that they are happy on the whole anyway.
This is the result of China's first White Paper on Netizens' Health Conditions issued on Wednesday by 39.net, China's largest authoritative website on health sciences. It is the first most comprehensive health survey on netizens' health situation ever conducted in China in ten years' time. The white paper came out after two months of online and offline research that involved over 150 thousand netizens, covering topics and questions on health knowledge, mental situation, sense of health, and living habits.
According to the white paper, more than 70 percent of China's netizens say they are suffering from mental problems such as bad memory, anxiety, depression, and a lack of confidence. And a similar 72 percent of them also say they are often suffering from diseases like insomnia, dizziness, joint degeneration and achings. Meanwhile, another 53 percent of netizens believe that white collar employees who have bigger work pressures are more likely to catch mental problems.
The white paper adds, doing almost no sports and spending long time surfing online lead to the above mentioned health problems among netizens. Only 9 percent of netizens take up sports on weekends while over 40 percent stay home, surfing. And only 16 percent netizens can assure more than eight hours' sleeping daily.
At present, China has a netizen population of 162 million, with a monthly consumption of 186 yuan, or about 25 dollars, on Internet surfing.
68. The national survey on netizens' health situation ________.
A. was conducted by sohu.com B. is conducted every year
C. was carried out online and offline D. covered about half a million netizens
69. Which of the following has the closest meaning to the underlined part "white collar"?
A. White clothes. B. White offices. C. Office workers. D. White people.
70. All the following factors have been mentioned to cause the health problems among netizens EXCEPT ________.
A. doing no sports B. spending long time online
C. heavy work pressures D. shopping online
71. What's the main idea of the passage?
A. China has a large netizen population.
B. Many netizens in China have mental problems.
C. the Internet has a negative influence on people.
D. How to surf the Internet safely and healthily.
E
An early invention by Albert Einstein has been rebuilt by scientists at Oxford University. They are trying to develop an environmentally friendly refrigerator that runs without electricity.
We all know that modern fridges cause damage to the environment. They work by using a kind of man-made greenhouse gas called Freon (氟里昂), which is far more damaging than carbon dioxide.
Now Malcolm McCulloch, an electrical engineer at Oxford, is leading a three-year project to develop appliances that can be used in places without electricity.
His team has completed a prototype (样机) of a fridge patented in 1930 by Einstein. It used only pressurized gases to keep things cold. The design was partly used in the first refrigerators, but the technology was dropped when more efficient compressors (压缩机) became popular in the 1950s. That meant a switch to using Freon.
Einstein's idea uses butane (丁烷) and water and takes advantage of the fact that liquids boil at lower temperatures, when the air pressure around them is lower.
"If you go to the top of Mount Qomolangma, water boils at a much lower temperature than it does when you're at sea level and that's because the pressure is much lower up there," said McCulloch.At one side is the evaporator (蒸发器), a bottle that contains liquid butane. "If you introduce a new vapor above the butane, the liquid boiling temperature decreases and, as it boils off, it takes energy from the surroundings to do so," says McCulloch. "That's what makes it cold."
The gas fridges based on Einstein's design were replaced by Freon-compressor fridges partly because Einstein's design was not very efficient. But McCulloch thinks that by changing the design and replacing the types of gases used it will be possible to quadruple (翻两番) the efficiency.
However, McCulloch's fridge is still in its early stages. "It's very much a prototype," he said. "Give us another month and we'll have it working."
72．According to the passage, an early invention by Albert Einstein _______.
A．has been rediscovered because it costs much less and works more efficiently
B．is being redesigned because it could be used in places without electricity
C．has just been found to be energy-saving and environmentally friendly
D．will be fully made use of and become the fridge of the future
73．Which of the following is TRUE according to the text?
A．Freon was used in fridges long before the 1950s.
B．Freon is what makes current fridges big polluters.
C．McCulloch thinks he could improve Einstein's design by using other types of vapors.
D．The fridge Malcolm McCulloch and his team designed will be put into production soon.
74．We can learn from the text that the prototype completed _______.
A．changed the air pressure around it
B．was tested on the top of Mount Everest
C．increased the liquid boiling temperature
D．used only pressurized gases to keep things cold
75．McCulloch's words in Paragraph 6 _____.
A．serve as an explanation for the principle behind Einstein's fridge
B．give you the reason why Einstein's fridge was not efficient
C．tell you how to take advantage of low air pressure
D．show you how Einstein's fridge works
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