Air pollution is a leading cause of cancer and classified among Group 1,or top, human carcinogens (致癌物质), said the International Agency for Research on Cancer (IARC), which is the World Health Organization's (WHO) cancer agency, on Oct 17,2013.
The most widely used system for classifying carcinogens comes from the IARC, which places them into five groups. Group 1 carcinogens definitely cause cancer in humans. Group 2A is probably carcinogenic to humans, Group 2B is possibly carcinogenic, the carcinogenicity of Group 3 in humans is unclassifiable, and Group 4 is probably not carcinogenic to humans. Only a little more than 100 are classified as Group 1 cancer-causing substances, including ultraviolet radiation and tobacco smoke.
“Our task was to evaluate the air everyone breathes rather than focus on specific air pollutants,” the lARC's Dana Loomis said in a statement. “The results from the reviewed studies point in the same direction: the risk of developing lung cancer is significantly increased in people exposed to air pollution.”
In 2010, lung cancer resulting from air pollution killed 223,000 people worldwide, and there was also convincing evidence that it increases the risk of bladder (膀腕) cancer, according to the IARC.
Air pollution is already known to raise risks for a wide range of illnesses, including respiratory and heart diseases.
Air pollution is global, although the levels of it vary over space and time.
Loomis said people in Asia, eastern North America, some places in Central America and Mexico, as well as North Africa have relatively high exposure. Developing countries with large populations and booming manufacturing sectors, such as China, are particularly at risk.
Many cities in China, such as Beijing, frequently see smog. This week, Harbin, the capital city of Heilongjiang province, became the first Chinese city to officially suspend classes due to serious smog
Many developed countries face similar problems, although to a lesser degree than most developing nations. In Europe, levels of many pollutants have fallen. But between 91 and 96 percent of Europeans living in cities are exposed to levels of PM2.5—tiny particles with a diameter of less than 2.5 micrometers—that are higher than the WHO safety limits, says a report published by the European Environment Agency on Oct 15.
Although both the composition and levels of air pollution can vary dramatically from one location to the other, the 1ARC said its conclusions apply to all regions of the world.
“Given the scale of the exposure affecting people worldwide, this report should send a strong signal to the international community to take action without further delay,” said Christopher Wild, director of the IARC.What might be the best title of the passage?
| A．Signals of air pollution |
| B．Safety limits of air pollution |
| C．Air pollution, cancer risk |
| D．Air pollution, smog risk |
What’s the main task of IARC?
| A．To focus on cancer-causing substances. |
| B．To evaluate the air quality. |
| C．To study the developing risk of cancer. |
| D．To send signals to the international community. |
Why should the international community take action without further delay?
| A．The composition and levels of air pollution vary from place to place. |
| B．More and more people in developing countries are exposed to air pollution. |
| C．Developed countries face air pollution, the level of which is higher than the safety limits. |
| D．A large number of people worldwide are exposed to air pollution. |
The Internet has come a long way in the last couple of decades, and we’re seeing some noticeable generational trends. For instance, one of my friend’s aunts ”friended me” on Facebook, and I noticed that she had three times the number of Facebook friends as her nephew, despite the fact that she has only recently started to spend more time on the Internet. She spends more time on Facebook than he does. Yet he is part of the younger generation that grew up using the Internet.
The beauty of Facebook is in the packaging of the service. Almost every facet of Facebook is technology that existed from years before: e-mail, instant messaging, photo galleries, personal Web pages, RSS, etc. Facebook has taken these functions, which young people have been able to do for the past decade, and made them more user-friendly, more accessible—for young and older generation alike.
Facebook is the second act in the people’s Internet Revolution; the first being America Online, which spurred the adoption of the Internet in the homes of ordinary Americans. In a similar fashion, Facebook is spurring the adoption of Internet use in demographics that have been dismissed as the non-Internet users. It gives people a reason to be online in a way that simply checking e-mail, the 1996 equivalent, did not. Facebook is active in a way that the general population may find more rewarding.
The ability to communicate (or not communicate) with your friends in different ways also heightens the ‘stickiness’ of the service. For example, it tells you who else is using Facebook right now. You can then exchange instant messages with any of them. There’s always one more thing to check, see, or do on Facebook. It’s like a never-ending dinner party and all your friends and family are invited.Compared with the aunt, the nephew ___ .
| A．had 3 times the number of friends |
| B．has spent more time on the Internet all the time |
| C．spends less time on Facebook |
| D．had the access to the Internet only when he grew up |
What does the underlined word in the second paragraph refer to?
| A．Young people |
| B．Old people |
| C．These functions |
| D．Young and old people |
Which is true according to the third paragraph?
| A．Facebook accelerated the adoption of the Internet in the ordinary families. |
| B．America Online was the first act in the Internet Revolution. |
| C．Facebook has spurred the application of the Internet use in demographics. |
| D．America Online spurred the ordinary use in all od the world families. |
Using Facebook, you can ___.
| A．communicate with whoever is using the Facebook right now |
| B．do one thing every time |
| C．have dinner together with your friends and families |
| D．tell you anyone who is not using the Facebook |
What is the main idea of the passage?
| A．The drawbacks and the strengths of the Facebook. |
| B．Facebook makes the communication more convenient for the old and the young. |
| C．People’s Internet Revolution: Facebook. |
| D．Facebook and America Online |
Tang Dynasty poets sang for about three centuries in different tones. There were many famous poets living in the Tang period, such as Li Bai, Du Fu, Bai Juyi and Li Shangyin. Poems of the Tang Dynasty edited in the Qing Dynasty is a collection of more than 48,900 poems that were written by over 2,200 poets. But it didn’t cover all the poems of the Tang Dynasty.
During the Tang Dynasty, poems were recited when lovers walked under the moonlight. Poems were also recited when soldiers fought on the battlefield. People recited them in the open air or at temple fairs.
Tang Dynasty poets wrote poems to win fame and also to develop their temperament(性情). They poured our deep feelings for their friends and criticized injustice in the world through poems.
In the Tang Dynasty scholars had to be poets. Their readers were not only people of high social position but also common people. Poets recited poems, women singers sang poems and other ranks of people, including old women and children, read Tang poems. This atmosphere affected foreigners who visited the country at that time. As a result, Tang poetry was introduced to some adjacent countries, like Japan and Vietnam.
Tang poetry is a most brilliant page in the history of ancient Chinese literature. It’s a miracle(奇迹) in the cultural history of mankind. The Tang Dynasty was a powerful empire with a vast territory. It inherited(继承) Chinese civilization that went back to ancient times, was combined with the best of other cultures and adopted the benefits of other nations in the world. Tang poetry wasn’t the only spiritual wealth created by the Tang Dynasty people. Philosophy and religion, handwriting and painting, and music and dance all gained new peaks of development. Tang poetry, however, was the jewel in the crown and its greatest achievement.We can conclude form the passage that ___ .
| A．only people in the Tang Dynasty created poems |
| B．in total there was four famous poets in the Tang Dynasty |
| C．the Tang Dynasty probably existed for about three centuries |
| D．in the Tang Dynasty most common people were poets |
Which of the following is NOT mentioned in the passage?
| A．Why the poets created poems? |
| B．Some other kinds of spiritual wealth in the Tang Dynasty. |
| C．The significance and influence if the Tang Dynasty. |
| D．The editors of Poems of the Tang Dynasty. |
The underlined word “adjacent”probably means ___ .
| A．strong |
| B．neighboring |
| C．poor |
| D．rich |
What does the author really want to tell us in Paragraph 4?
| A．Tang Dynasty poems were quite popular. |
| B．In the Tang Dynasty all scholars were poets. |
| C．Many foreigners came to our country during the Tang Dynasty. |
| D．in the Tang Dynasty many poems were sung by women singers. |
Strange stones of Costa Rica
One of the strangest mysteries in archacology was discovered in the Diquis River Delta, in southern Costa Rica. Since the 1930s, hundreds of stone balls have been found. They range in size from a few centimeters to over two metres in diameter.
Who made these perfect spheres(球体) and how they made them remains a mystery. Some researchers believe the stones were made by extreme heating followed by cooling. People could have polished the spheres with sand or leather. The ancient Costa Ricans had no written language so there is no written record of just how they made the spheres.
Almost all are made of granite (花岗岩), a hard stone created by volcanoes. The granite quarries(采石场) were 25 to 30 miles away from the largest stones, which weigh more than 10 tons each. Nobody knows how people moved them..
Many of the stones have been found near the remains of houses or graves. Some believed that the stones contained hidden treasures and a few have been smashed but nothing has been found inside. Despite these losses, the National Museum of Costa Rica has recorded 130 spheres. However, many stones are not included because they have been removed from their original sites and used as ornaments(装饰) in homes, gardens and churches. Clearly, there are also many stones that lie undiscovered.The stones were discovered ___ .
| A．near the volcanoes |
| B．in southern Costa Rica |
| C．in a grave |
| D．in churches |
The writer ___ in the passage.
| A．admires the spheres very much |
| B．doesn’ t believe the spheres were once made by humans |
| C．tells us a discovery |
| D．thinks highly of the spheres |
The underlined word ”polished” refers to “___”.
| A．buried |
| B．wrapped |
| C．made shining |
| D．made big |
According to the passage, which of the following is true?
| A．The stone balls found in the Diquis River Delta are all very huge. |
| B．The stone balls were unearthed from the graves. |
| C．The local people show great interest in the stone balls. |
| D．There are a lot of treasures in the stone balls. |
The passage mainly tells us ___ .
| A．the stones are of great value. |
| B．the stones proved to be made by non-humans. |
| C．the stones are mystery. |
| D．the stone are ornaments. |
Tang Dynasty poets sang for about three centuries in different tones. There were many famous poets living in the Tang period, such as Li Bai, Du Fu, Bai Juyi and Li Shangyin. Poems of the Tang Dynasty edited in the Qing Dynasty is a collection of more than 48,900 poems that were written by over 2,200 poets. But it didn’t cover all the poems of the Tang Dynasty.
During the Tang Dynasty, poems were recited when lovers walked under the moonlight. Poems were also recited when soldiers fought on the battlefield. People recited them in the open air or at temple fairs.
Tang Dynasty poets wrote poems to win fame and also to develop their temperament(性情). They poured our deep feelings for their friends and criticized injustice in the world through poems.
In the Tang Dynasty scholars had to be poets. Their readers were not only people of high social position but also common people. Poets recited poems, women singers sang poems and other ranks of people, including old women and children, read Tang poems. This atmosphere affected foreigners who visited the country at that time. As a result, Tang poetry was introduced to some adjacent countries, like Japan and Vietnam.
Tang poetry is a most brilliant page in the history of ancient Chinese literature. It’s a miracle(奇迹) in the cultural history of mankind. The Tang Dynasty was a powerful empire with a vast territory. It inherited(继承) Chinese civilization that went back to ancient times, was combined with the best of other cultures and adopted the benefits of other nations in the world. Tang poetry wasn’t the only spiritual wealth created by the Tang Dynasty people. Philosophy and religion, handwriting and painting, and music and dance all gained new peaks of development. Tang poetry, however, was the jewel in the crown and its greatest achievement.We can conclude form the passage that ___ .
| A．only people in the Tang Dynasty created poems |
| B．in total there was four famous poets in the Tang Dynasty |
| C．the Tang Dynasty probably existed for about three centuries |
| D．in the Tang Dynasty most common people were poets |
Which of the following is NOT mentioned in the passage?
| A．Why the poets created poems? |
| B．Some other kinds of spiritual wealth in the Tang Dynasty. |
| C．The significance and influence if the Tang Dynasty. |
| D．The editors of Poems of the Tang Dynasty. |
The underlined word “adjacent”probably means ___ .
| A．strong |
| B．neighboring |
| C．poor |
| D．rich |
What does the author really want to tell us in Paragraph 4?
| A．Tang Dynasty poems were quite popular. |
| B．In the Tang Dynasty all scholars were poets. |
| C．Many foreigners came to our country during the Tang Dynasty. |
| D．in the Tang Dynasty many poems were sung by women singers. |
Computers are very important to modern life. Many people think that in the future computers will be used in lots of everyday life. It is thought that we won’t have to go shopping because we will be able to get most things which are sold in shops on the Internet. There will be no more books because we will be able to get all texts from computers. The Internet will be used to play games, see films and buy food. Most telephone calls will be made by computers, too.
Some people are glad about these new ways of shopping and communicating. Others do not think that computers will replace our old ways.
Let’s look at books, for example. Some people think that one day we will not read books made of paper. Instead, we will buy and read books using computers. We will read texts on small pocket computers. The computers will keep many different books in them at the same time. We won’t need to turn lots of pages and paper will be saved. Computerized(计算机化) books will be used more and more.
Is Internet shopping such a pleasure as going to the shop? Many people say it is not. It is a pleasure to go into shops and look at things you want to buy. It is also unlikely that many people will want to read large texts on our computers. Because paper books will perhaps be more friendly. Maybe computers won’t change these two habits.In paragraph 1 it is thought people will use computers for ___.
| A．playing games, shopping and making telephone calls |
| B．making telephone calls, having meals and seeing films |
| C．seeing films, buying food, and going for holidays |
| D．playing games, making telephone calls and seeing the doctor |
Which reason for using computerizes books is NOT said in the passage?
| A．Computerized books won’t be very expensive. |
| B．Computers can keep many different books in them. |
| C．We won’t have lots of pages. |
| D．We won’t need any paper. |
Paragraph 4 tells ___.
| A．about the old and new ways of shopping and communicating |
| B．if the Internet will change our habits |
| C．about computerized books |
| D．about future uses of computers |
The title for this passage is ___ .
| A．Computers will replace shops and books |
| B．Computers are the future |
| C．Computers will do everything for man |
| D．How computers change our habits |
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