A recent study, while showing a generally positive attitude toward science, also suggests a widespread worry that it may be “running out of control”．This idea is dangerous．

       Science can be a force for evil as well as for good．Its applications can be channeled either way, depending on our decisions．The decisions we make, personally or collectively, will determine the outcomes of science．But here is a real danger．Science is advancing so fast is so strongly influenced by businesses that we are likely to believe whatever decisions we come to will make little difference．And, rather than fighting for the best possible policies, we may step back and do nothing．

       Some people go even further．They say that despite the moral and legal objections （反对）, whatever is scientifically possible will be done ——somewhere, sometime．They believe that science will get out of control in the end．This belief is dangerous too, because it a fuels sense of hopelessness and discourages them from making efforts to build a safer world．

       In our interconnected world, the lack of agreement in and of the world of science can lead to the failure to control the use of science．Without a common understanding, the challenges of “controlling” science in this century will be really tough．Take human cloning for example．Despite the general agreement among scientists on its possible huge impact （影响） on traditional moral values, some countries still go ahead with the research and development of its related techniques．The outcomes are hard to predict．

       Therefore, discussions on how science is applied should be extended far beyond scientific societies．Only through the united efforts of people with hope, can we be fully safe against the misuse of science and can science best serve mankind in the future．

What can we conclude from the recent study?

       A．People think highly of science．

       B．People hold mixed opinions about science．

       C．Science is getting dangerously out of control．

       D．Science is used for both good and bad purposes．

According to the passage, what will happen if we hold that science is getting beyond control?

       A．The development of science will hopelessly slow down．

       B．Businesses will have even greater influence on science．

       C．The public will lose faith in bringing about a bright future．

       D．People will work more actively to put science under control．

The discussion should reach beyond scientific societies because __________．

       A．scientists have failed to predict the outcomes

       B．the ties between different areas need strengthening

       C．united efforts are necessary for the development of science

       D．people need to work together to prevent the bad use of science

What is the main idea of the passage?

       A．Science and its applications bring us many dangers．

       B．The development of science mostly lies in people’s attitudes．

       C．Mankind can largely take control of science with their efforts．

       D．The future of science will be influenced by the dangerous ideas．

D

Life has changed in Mexico City．Streets normally filled with people are empty．One of the most popular professional soccer teams recently played a game in an empty stadium that can seat more than100,000 people．It's swine （猪）flu that has made life in Mexico City grind to a halt （慢慢停了下来）．

Seemingly out of nowhere, swine flu has caused confirmed deaths in 12 countries as of April 30．It has sent a wave of alarm around the world．Governments are trying to find ways to prevent further out-breaks．The World Health Organization has raised its swine flu global threat level to five out of six．

People may be familiar with bird flu, but they know little about swine flu．Swine flu is a contagious（传染性） respiratory（呼吸的）disease in pigs．It is caused by a type-A influenza virus．

Humans can also catch swine flu．The virus causes regular outbreaks in pigs, but people usually do not catch it．However, there have been cases of the virus spreading to people, and then from one person to another．

The symptoms of swine flu are similar to the common flu．They include fever, lethargy （无精打采）, lack of appetite, coughing, runny nose, sore throat, nausea（恶心）, and vomiting （呕吐）．The high proportion of young adults among the deaths is one of several mysteries about this virus．Most of the dead had lung damage．What caused it is not yet known．

The virus spreads the same way the common flu does．When an infected person coughs or sneezes around another person, the latter is put at risk．People can get the disease by touching something with the flu virus on it and then touching their mouth, nose or eyes．

There are medicines to treat swine flu．Doctors suggest using anti - viral drugs．They keep the virus from reproducing inside the body．

And there are vaccines for it now, several everyday steps can also help prevent the spread of the virus: washing hands frequently; avoiding close contact with people who are sick; and avoiding touching surfaces that might have the virus on it．

People may worry that they will get swine flu from eating or preparing pork．In fact, you cannot catch the virus from pork products if they have been properly prepared and cooked．Cooking food at temperatures of 71℃ kills the virus．

69．What is the main idea of the passage?

       A．It mainly tells us how swine flu broke out in Mexico City．

       B．It presents the reader with some information concerning swine flu．

       C．It tells us the differences between swine flu and bird flu．

       D．It mainly tells readers the dangers caused by swine flu．

70．The following tips can protect us from swine flu EXCEPT _________．

       A．keeping us away from other people

       B．washing hands frequently

       C．avoiding close contact with sick people

       D．avoiding touching surfaces that might have the virus on them

71．What's the main idea of the first paragraph?

       A．Mexico City is really a place of horror now．

       B．People in Mexico City like staying at home．

       C．People in Mexico City don't like soccer．

       D．Swine flu has seriously affected people's life in Mexico City．

72．What can we infer from the passage?

       A．At present there still aren't effective vaccines for swine flu．

       B．Swine flu is preventable，controllable and curable．

       C．From now on, people can't eat pork if they want to be safe．

       D．All of the dead killed by swine flu had lung damage．

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.

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

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

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

A small piece of fish each day may keep the heart doctor away. That’s the finding of a study of Dutch men in which deaths from heart disease were more than 50 percent lower among those who consumed at least an ounce of salt water fish per day compared to those who never ate fish.

The Dutch research is one of three human studies that give strong scientific support to the long held belief that eating fish can provide health benefits, particularly to the heart.

Heart disease is the number-one killer in the United States, with more than 550,000 deaths occurring from heart attacks each year. But previous research has shown that the level of heart disease is lower in cultures that consume more fish than Americans do. There are fewer heart disease deaths, for example, among the Eskimos of Greenland, who consume about 14 ounces of fish a day, and among the Japanese, whose daily fish consumption averages more than 3 ounces.

For 20 years, the Dutch study followed 852 middle-aged men, 20 percent of whom ate no fish. At the start of the study, average fish consumption was about two-thirds of an ounce each day, with more men eating lean fish than fatty fish.

During the next two decades, 78 of the men died from heart disease. The fewest deaths were among the group who regularly ate fish, even at levels far lower than those of the Japanese or Eskimos. This relationship was true regardless of other factors such as age, high blood pressure, or blood cholesterol（胆固醇）levels.

The passage is mainly about _________.

A．the high incidence of heart disease in some countries   

B．the changes in people’s diet    

C．the effect of fish eating on people’s health

D．the daily fish consumption of people in different cultures

We can infer from the passage that there are fewer heart disease deaths ________.

A．in countries of the yellow-skin race

B．in highly-developed countries

C．in the countries with high consumption of fish 

D．in the countries with good production of fish

The phrase “this relationship” in paragraph 6 refers to the connection between _________ and the level of heart disease.

A．the amount of fish eaten  B．regular fish-eating  

C．the kind of fish eaten      D．people of different areas

From the passage we know the author is most probably ______.

A．a heart doctor   B．a science researcher

C．a supporter of healthy eating   D．a university student

Between their crazy schedules and upside-down circadian（昼夜节律的） rhythms, teens have always been somewhat sleep-deprived（剥夺）．Now technology is making it worse．
Teens are not just texting, instant-messaging and surfing Facebook all day; they’re sleeping with their cell phones or laptops, too．Or rather, not sleeping．And doctors and parents, many of whom raised in an era when phones were attached to walls, are concerned．
“So many teens are having sleep issues, and parents aren’t necessarily regulating the use of the electronic devices enough,” says Margie Ryerson, a therapist．“It’s impossible to wind down and relax the body, the mind, the senses and be ready to fall asleep．”
“We all know teens don’t get enough sleep in general,” says San Francisco．“As long as parents allow teens to have these devices in their bedrooms at night, teens will be tempted（诱惑） to use them．”… Teens would socialize 24/7 if they could．
Ryerson calls it the CNN syndrome of teenhood— round-the-clock reports on breaking news about everything, from homework to wardrobe choices to ice-cream cravings．
Sleep deprivation is linked to memory and concentration problems, anxiety and depression, and moodiness．“Many people assume these problems arise directly from adolescence, which is not really true,” he says．“The real issue is sleep deprivation．Late-night texting can certainly make the situation worse．”
“The psychology behind this constant contact is certainly understandable,” Ryerson says．“It comes from wanting to avoid being left out．They won’t be considered important and significant in their peer group, if they don’t know what’s going on．If they’re on top of everything, they belong,” she says．
“What helps, at least for younger kids,” says Ryerson, “is parental involvement．If all of their friends are all able to text into the early hours of the night, it is hard for a middle or high schooler to set the limit themselves．Often they appreciate parents stepping in．”
“As parents, we want our kids to be happy, healthy and responsible,” she says, “and the most necessary requirement for achieving balance is to first take care of ourselves physically — eating well, exercising and getting enough sleep．”
【小题1】According to Ryerson, it seems that ____．