We’ve heard about radiation from the damaged nuclear reactors in Japan reaching American shores. Experts say so far there is no reason to worry, and point out that we meet radiation every day. Where and how? NPR’s Renee Montagne posed that question to Peter Caracappa, a radiation safety officer and professor of nuclear engineering.
MONTAGNE: How many things emit radiation?
Dr CARACAPPA: Well, radiation and radioactive material is a part of nature. So everything that’s living has some amount of radiation coming from it—a very small amout. Plus there’s radiation in the ground and the air.
So the extremes are uranium in the soil to bananas?
Yes.
By the way, why do bananas have radiation?
Bananas have a lot of potassium(钾). And a small amount of potassium naturally is called potassium 40, which is radioactive
What’s the difference between radiation that’s harmful and not harmful?
Well, the term radiation can apply to a lot of different things. But the harmful radiation is ionizing(离子)radiation. It has enough energy that it can make chemical changes in material. We could get ionizing radiation from an X-ray, for example. It’s the kind of radiation that causes cancer.
The broader definition of radiation includes a lot of things that we call non-ionizing radiation. That includes everything like radio waves and visible light and your microwave.
So what then is the largest contributor of ionizing radiation?
For the natural sources of ionizing radiation, actually the biggest chunk of that tends to come from radon(氡), which is a radioactive material that is present in the air. It can become a concern when it builds up in low-lying areas of homes like basements.
Would it be fair to say that most people do not need to worry about the danger of being exposed to radiation?
I would say that the everyday exposure to radioation that we meet contributes an extremely tiny risk to our life or to our health compared to all of the other risks that we meet in our day-to-day life.We can infer from the first paragraph that radiation is______.
| A．rare | B．powerful | C．dangerous | D．common |
The passage may be _______.
| A．an interview | B．an argument | C．a talk show program | D．a science report |
Whether radiation is harmful or not depends on______.
| A．whether it has a small amount of potassium |
| B．whether it changes chemical in materials. |
| C．whether it has energy to change materials |
| D．whether it is visible in life |
The purpose of writing this passage is to _______.
| A．advise on how to protect us from radiation |
| B．analyze what causes radiation in daily life |
| C．warn people of the danger of radiation |
| D．expect people not to fear everyday radiation |
Earlier this month, the Obama Administration called for increased protection of the world’s most southern continent, Antarctica. Scientists say climate change and human activity have increasingly led to the melting of massive pieces of Antarctic ice. The disappearance of ice will not only affect wildlife in the area such as seals and penguins. The melting will also cause oceans and seas around the world to rise.
This represents a major threat, especially to coastal areas. For example, the ancient city of Venice, Italy has long been threatened by rising sea levels. The situation is made worse by the fact that its ancient buildings, built on a body of water called a lagoon( 淡水湖), are slowly sinking. When the city was founded about 1,600 years ago, the level of the Adriatic Sea was almost two meters lower than it is today.
Rising sea levels are not the only threat. The salty water is also destroying Venice’s famous buildings and artworks. The Italian government is trying to fix the problem with the construction of a seven-billion-dollar system of moving flood barriers.
Climate change is also leading to the melting of ice in other areas, such as Mount Kilimanjaro in northeastern Tanzania. It is the highest point in Africa, measuring almost 6,000 meters. The mountain supports five vegetation zones and many kinds of animals.
The ice glaciers on the mountain are disappearing very quickly. This will have a bad effect on the mountain’s ecosystems and on Tanzania’s travel industry. Also, a valuable record of thousands of years of weather history will also be lost if the ice melts. Scientists study pieces of glacier to understand weather patterns from thousands of years ago.
In the United States, the icy masses in Glacier National Park in Montana may soon completely disappear because of climate change. In 1850, there were an estimated 150 glaciers in the more than 400,000 hectare park.
There are 26 glaciers remaining today. Scientists estimate that the glaciers will be gone by 2030. Warming temperatures are also threatening the many kinds of plants and animals that live in this mountain ecosystem. The writer developed the passage mainly by______.
| A．giving examples | B．listing reasons |
| C．making comparisons | D．using quotations |
How many glaciers disappeared since 1850 in Glacier National Park?
| A．150. | B．26. | C．400,000. | D．About 124. |
According to the passage, what has been affected in Italy by rising sea levels?
| A．Many kinds of plants and animals died out in Italy. |
| B．Venice’s famous buildings and artworks are being destroyed completely. |
| C．The ice glaciers on the mountain are disappearing very quickly. |
| D．Its ancient buildings could be drowned. |
What could be the best title for the passage?
| A．Climate Change |
| B．The Melting of Massive Pieces of Antarctic Ice |
| C．Visiting Endangered Places around the World |
| D．The disappearing of the Ice Glaciers |
Imagine yourself on a boat looking out at the horizon and all you can see is the water meeting the sky with no land in sight and you are sailing straight ahead to meet the world. Jesse Martin does not have to imagine: he is living in it.
On Dec. 7, 1998, at 17 years old, Jesse set sail from Melbourne, Australia on his boat, attempting to become the youngest person to sail alone and nonstop around the world. He sailed south of New Zealand, through the South Pacific, around South America, north on the Atlantic, back south past Africa, through the Indian Ocean and back to Melbourne.
Even as a young child, Jesse had been an adventurer who traveled all over Europe and Asia with his parents. Born in Munich, Germany in 1981, he moved to Australia with his family when he was only two years old. They moved close to a rainforest in Cow Bay, about 3500kms north of Melbourne, where they built a small house with no electricity or running water. Jesse grew up at the beach enjoying the outdoors to its fullest.
At 14, he sailed for the first time with his father and brother, Beau. It was after this trip that he began to dream about sailing around the world.
Jesse’s family played an important role. “I was made to believe I could do anything.” he says. Although, he says, there were others that were not so encouraging or supportive, “People that I looked up to, respected and trusted told me I couldn’t. Thankfully, I trusted myself. There were people that said that the boat couldn’t be ready by the time I had to leave.” However, through perseverance and belief in himself he was able to do what many told him was impossible.
On Oct.31, 1999, more than 10 months after he set sail, Jesse Martin went down in history as the youngest person to sail around the world alone, nonstop and unassisted. What’s the author’s purpose in encouraging the reader to imagine a sailing experience?
| A．To show how difficult it is to be a sailor. |
| B．To show how wonderful Jesse’s sailing is. |
| C．To describe what Jesse’s sailing is like. |
| D．To describe what a sailor’s life is like. |
Jesse Martin was at the end of his voyage when he _______.
| A．sailed on the South Pacific. |
| B．sailed on the Indian Ocean. |
| C．sailed past Africa |
| D．sailed past South America. |
Which of the following made Jesse decide to sail alone around the world?
| A．His childhood adventure experiences. |
| B．His journeys to Europe. |
| C．His first sailing trip with his family. |
| D．His love for outdoor activities. |
What can we learn from Jesse Martin’s story?
| A．Interest leads to success. |
| B．A strong belief will make a person stronger. |
| C．Life is an unusual adventure we should enjoy. |
| D．Failure is the mother of success. |
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| A．Students of the French language |
| B．Language experts doing research into French |
| C．Teachers who are eager to improve their students’ French |
| D．Parents who want their children to learn French quickly and easily |
Rocket French Premium describes itself as.
| A．free and funny | B．practical and interactive |
| C．slow but efficient | D．suitable for everyone |
．The advertisement claims learners of Rocket French Premium.
| A．will speak fluent French in six days |
| B．can take the entire course for free |
| C．will practice French in a restaurant or airport |
| D．won’t have to worry about the security of their e-mail addresses |
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| A．speed up | B．pick up | C．change | D．solve |
Someday a stranger will read your e-mail without your permission or scan the websites yo
u’ve visited. Or perhaps someone will casually glance through your credit card purchases or cell phone bills to find out your shopping preferences or calling habits.
In fact, 
it’s likely some of these things have already happened to you. Who would watch you without your permission? It might be a spouse, a girlfriend（配偶）, a marketing company, a boss, a cop or a criminal, Whoever it is, they will see you in a way you never intended to be seen -- the 21st century equivalent of being caught naked.
Psychologists tell us boundaries are healthy, that it’s important to reveal yourself to friends, family and lovers in stages, at appropriate times. But few boundaries remain. The digital bread crumbs （面包屑）you leave 
everywhere make it easy for strangers to reconstruct who you are, where you are and what you lik
e. In some cases, a simple Google search can reveal（泄露）what you think. Like it or not, increasingly we live in a world where you simply cannot keep a secret.
The key question is: Does that matter?
For many Americans, the answer apparently is "no."
When opinion polls ask Americans about privacy, most say they are concerned about losing it A survey found an overwhelming pessimism（悲观）about privacy, with 60 percent of respondents saying they feel their privacy is "slipping away, and that bothers me."
But people say one thing and do another. Only a tiny fraction of Americans change any behaviors in an effort to preserve their privacy. Few people turn down a discount at tollbooths （收费处）to avoid using the EZ-Pass system that can track automobile movements. And few turn down supermarket loyalty cards. Privacy economist Alessandro Acquisti has run a series of tests that reveal people will surrender personal information like Social Security numbers just to get their hands on a pitiful 50-cents-off coupon (优惠券).
But privacy does matter -- at least sometimes. It’s like health: When you have it, you don’t notice it. Only when it’s gone do you wish you’d done more to protect it.What would psychologists advise on the relationships between friends?
| A．Friends should open their hearts to each other. |
| B．There should be a distance even between friends |
| C．Friends should always be faithful to each other. |
| D．There should be fewer disputes between friends. |
Why does the author say "we live in a world where you simply cannot keep a secret" ?
| A．Modern society has finally evolved into an open society. |
| B．People leave traces around when using modern technology. |
| C．There are always people who are curious about others’ affairs. |
| D．Many search engines profit by revealing people’s identities. |
What do most Americans do with regard to privacy protections?
| A．They change behaviors that might disclose their identity. |
| B．They use various loyalty cards for business transactions. |
| C．They rely more and more on electronic devices. |
| D．They talk a lot but hardly do anything about it. |
According to the passage, privacy is like health in that ______.
| A．people will make every effort to keep it |
| B．its importance is rarely understood |
| C．it is something that can easily be lost |
| D．people don’t cherish it until they lose it |
Anthony Horowitz was miserable as child. He was, as he put it, “not very bright” and couldn’t win the attention of his very wealthy parents, who preferred his “clever” older brother. At age 8, Horowitz was sent away to an abusive boarding school in his native England, even though he screamed and pleaded(恳求) with his parents year after year not to send him. “The thought was, It’ll be good for him,” he recalled.
It was not. Horowitz did badly in his studies, had few friends and was bullied (欺负) for five yea
rs. “My teachers couldn't have had a lower opinion of me,” he said. “I wasn't even smart enough to rebel . The one thing I remember from the very earliest age was this desire to write. When I was 10 years old, I remember asking my parents to get me a typewriter for my birthday because I wanted to be a writer.”
Now, at age of 55, Horowitz is one of the world's most successful children's book authors. His Alex Rider series has sold more than 5 million copies, and the eighth book featuring the young spy, Crocodile Tears, came out this month.
The Alex Rider books tell the adventures of 14-year-old Alex Rider, an agent for the British intelligence agency M16.
Horowitz said he doesn't try to write for kids; it just comes out that way. “I have a feeling it's to do with purity and simplicity. I give as little information as is necessary to describe the room, the character in the room, and get on with the action,” he said.
The style has also made Horowitz a successful writer of television shows for adults in Britain because, he says, writing books for kids is a lot like writing television for grown-ups: In both cases, it's all about entertaining people with a good story.
Now, Horowitz couldn't be happier with his life. He sums up his success: “…you can be anything you want to be if you just believe in yourself. I do believe it completely.” In the boarding school, Horowitz’s teachers .
| A．often criticized him | B．showed great concern for him |
| C．taught him how to write stories | D．thought little about his ability |
Which of the following is true of Anthony Horowitz?
| A．He was the beloved child of his family. |
| B．He benefited a lot from boarding school. |
| C．He emphasizes the plot rather than character in stories. |
| D．Although he is successful, he isn’t very happy. |
What advice does Horowitz have for readers?
| A．Confidence is the key to success. | B．Hardship teaches valuable lessons. |
| C．Interest is the best teacher. | D．Industry is the parent of success. |
In w
hich section can you most probably read the passage?
| A．Campus Trends | B．Culture & Leisure |
| C．Our World |
D．Science Life |