Fifteen percent of US teenagers aged 12 to 17 who own mobile phones have received nude（裸體）or nearly nude images of someone they know, according to a survey released on Tuesday.

Only four percent of mobile phone-owning   1  in that age group have sent sexually suggestive pictures of themselves, a practice known as "sexting,"   2  the Pew Research Center’s Internet & American Life Project.

The Pew survey found that girls and boys were equally as likely to have sent a suggestive picture to   3 person and  4   teenagers were more likely to have engaged in "sexting."

Eight percent of 17-year-olds with mobile phones have sent a sexually provocative（刺激的） image  5   texting and 30 percent have  6    a nude or nearly nude image on their phone.

Only four percent of 12-year-olds have sent suggestive images of   7  .

Amanda Lenhart, a senior research specialist at Pew and the author of the report, said sexually suggestive images have become a   8   of "relationship currency" for teens.

"These images are    9  as a part of or instead of sexual activity, or as a way of starting or  10  a relationship with a significant other," she said. "And they are also passed  11   to friends for their entertainment value, as a joke or for   12  ."

"The desire for risk-taking and sexual exploration during the teenage years   13   with a constant connection via mobile devices creates a 'perfect storm' for sexting," said Lenhart.

"Teenagers have always grappled with issues around sex and   14   , but their coming-of-age mistakes transgressions have never been so easily   15   and stored for others to see," she added.

The survey found that teens with unlimited text messaging plans were more likely to receive "sexts"   16   images of people they know. About 75 percent of mobile phone owning teens have unlimited plans.

Among this group, Pew said 18 percent reporting receiving "sexts"    17   with eight percent of teens on    18   data plans and three percent of teens who pay per message.

According to Pew, 58 percent of 12-year-olds own a mobile phone and 83 percent teens aged 17   19    .

Pew noted that a number of US states are grappling with how to  20   "sexting" among minors and some legislatures(立法機(jī)關(guān)) have stepped in to consider laws that would downgrade charges from felonies（重罪） to misdemeanors（輕罪）.

Pew conducted telephone interviews with 800 teens aged 12 to 17 and their parents between June 26 and September 24.

(   ) 1. A. teens                  B. adults               C. students            D. parents

(   ) 2. A. referring to               B. reporting          C. saying              D. according to

(   ) 3. A. other                 B. another             C. others               D. the other

(   ) 4. A. younger             B. fewer                      C. older                D. more

(   ) 5. A. by                     B. in                    C. on                    D. through

(   ) 6. A. accepted             B. received           C. sent                  D. mailed

(   ) 7. A. others                B. themselves        C. himself             D. herself

(   ) 8. A. habit                  B. system              C. method             D. form

(   ) 9. A. shared                B. limited             C. tasted                      D. controlled

(   ) 10. A. remaining         B. gaining             C. maintaining      D. obtain

(   ) 11. A. along                      B. by                    C. as                    D. for

(   ) 12. A. joy                  B. fun                  C. excitement        D. delight

(   ) 13. A. compared         B. followed           C. combined         D. went

(   ) 14. A. friendships       B. scholarships      C. relatives           D. relationships

(   ) 15. A. transmitted       B. transformed      C. formed             D. switched

(   ) 16. A. containing               B. concluding        C. including          D. concerning

(   ) 17. A. comparing               B. compared         C. connected         D. joined

(   ) 18. A. limited             B. unlimited          C. few                  D. little

(   ) 19. A. have                B. same                C. do                    D. too

(   ) 20. A. do with            B. deal with          C. remove             D. ban

Fifteen percent of US teenagers aged 12 to 17 who own mobile phones have received nude（裸體）or nearly nude images of someone they know, according to a survey released on Tuesday.

Only four percent of mobile phone-owning   1  in that age group have sent sexually suggestive pictures of themselves, a practice known as "sexting,"   2  the Pew Research Center’s Internet & American Life Project.

The Pew survey found that girls and boys were equally as likely to have sent a suggestive picture to   3 person and  4   teenagers were more likely to have engaged in "sexting."

Eight percent of 17-year-olds with mobile phones have sent a sexually provocative（刺激的） image  5   texting and 30 percent have  6    a nude or nearly nude image on their phone.

Only four percent of 12-year-olds have sent suggestive images of   7  .

Amanda Lenhart, a senior research specialist at Pew and the author of the report, said sexually suggestive images have become a   8   of "relationship currency" for teens.

"These images are    9  as a part of or instead of sexual activity, or as a way of starting or  10  a relationship with a significant other," she said. "And they are also passed  11   to friends for their entertainment value, as a joke or for   12  ."

"The desire for risk-taking and sexual exploration during the teenage years   13   with a constant connection via mobile devices creates a 'perfect storm' for sexting," said Lenhart.

"Teenagers have always grappled with issues around sex and   14   , but their coming-of-age mistakes transgressions have never been so easily   15   and stored for others to see," she added.

The survey found that teens with unlimited text messaging plans were more likely to receive "sexts"   16   images of people they know. About 75 percent of mobile phone owning teens have unlimited plans.

Among this group, Pew said 18 percent reporting receiving "sexts"    17   with eight percent of teens on    18   data plans and three percent of teens who pay per message.

According to Pew, 58 percent of 12-year-olds own a mobile phone and 83 percent teens aged 17   19    .

Pew noted that a number of US states are grappling with how to  20   "sexting" among minors and some legislatures(立法機(jī)關(guān)) have stepped in to consider laws that would downgrade charges from felonies（重罪） to misdemeanors（輕罪）.

Pew conducted telephone interviews with 800 teens aged 12 to 17 and their parents between June 26 and September 24.

(   ) 1. A. teens                  B. adults                   C. students            D. parents

(   ) 2. A. referring to               B. reporting          C. saying              D. according to

(   ) 3. A. other                 B. another             C. others               D. the other

(   ) 4. A. younger             B. fewer                      C. older               D. more

(   ) 5. A. by                         B. in                    C. on                    D. through

(   ) 6. A. accepted             B. received           C. sent                  D. mailed

(   ) 7. A. others               B. themselves        C. himself             D. herself

(   ) 8. A. habit                  B. system              C. method             D. form

(   ) 9. A. shared               B. limited             C. tasted                      D. controlled

(   ) 10. A. remaining        B. gaining             C. maintaining      D. obtain

(   ) 11. A. along                      B. by                    C. as                    D. for

(   ) 12. A. joy                  B. fun                  C. excitement      D. delight

(   ) 13. A. compared        B. followed           C. combined        D. went

(   ) 14. A. friendships      B. scholarships      C. relatives           D. relationships

(   ) 15. A. transmitted    B. transformed      C. formed             D. switched

(   ) 16. A. containing               B. concluding        C. including          D. concerning

(   ) 17. A. comparing               B. compared        C. connected        D. joined

(   ) 18. A. limited             B. unlimited          C. few                  D. little

(   ) 19. A. have               B. same               C. do                    D. too

(   ) 20. A. do with            B. deal with          C. remove             D. ban

Disposing of the garbage we produce every day is a major problem in cities around the world. In the United States, over 160 million tons of garbage is produced every year. Ten percent is recycled, ten percent is burned, and the rest is put in landfills. But finding land for new landfills is becoming more difficult.
A city that has solved this problem in an unusual way is Machida in Tokyo. They have developed a totally new way of dealing with garbage. The key to the operation is that people should work together. Families must divide their garbage into six groups:

1. garbage that can be easily burned, such as kitchen and garden trash 2. garbage that doesn’t burn easily, such as plastic tools and plastic toys 3. products that are poisonous or that cause pollution, such as batteries 4. bottles and glass containers that can be recycled 5. metal containers that can be recycled 6. large items, such as furniture and bicycles

    The items in Groups 1 to 5 are collected on different days. Large items are only collected upon request. Then the garbage is taken to a centre that looks like a clean new office building or hospital. Inside the centre, special equipment is used to sort and deal with garbage. Almost everything can be reused: garden or kitchen trash becomes fertilizer; garbage that can burn is burned to produce electricity; metal containers and bottles are recycled; and old furniture, clothing, and other useful items are cleaned, repaired, and resold cheaply or given away. The work provides employment for the disabled and gives them a chance to learn new skills.
Nowadays, officials from cities around the world visit Machida to see whether they can use some of these ideas and techniques to solve their own garbage problems.
【小題1】 Each year people in the U.S.A. have to find places to put in _______ million tons of garbage.
A.160           B.128               C.16                    D.32
【小題2】George’s family has the following garbage: wooden chairs, empty tins and branches. Into which group should he put the garbage?

A．Group 6, Group 5, Group 1.	B．Group 1, Group 3, Group 2.
C．Group 6, Group 5, Group 2.	D．Group 6, Group 4, Group 1.

【小題3】 From the text we know that ________ .

A．those who are working at the garbage disposal centre are disabled persons.

B．without people’s cooperation, the garbage disposal project would be a failure.

C．the items in Group1 and Group6 are not collected on the same day.

D．the garage is taken to a clean new office building for disposal.

The goal of earthquake prediction is to give early enough warning. The U.S. Geological Survey conducts and supports research on the likelihood of future earthquakes. Scientists estimate earthquake probabilities in two ways: by studying the history of large earthquakes in a special area and the rate at which strain（拉力）accumulates（積累）in the rock.
Scientists study the past frequency of large earthquakes in order to determine the future likelihood of similar large shocks. For example scientists researched the large earthquakes in the San Francisco Bay region during the 75 years between 1836 and 1911. For the next 68 years, no earthquakes of magnitude (震級(jí)) 6 or large occurred in the region. Beginning with a magnitude 6 shock in 1979, the earthquakes in the region increased dramatically; between 1979 and 1989, there were four magnitude 6 or greater earthquakes, including a magnitude 7.1 earthquake. So scientists estimated that the probability of a magnitude 6.8 or larger earthquake occurring during the next 30 years in the region is about 67 percent.
Another way to predict earthquakes is to study how fast strain accumulates. When plate movements build the strain in rocks to a critical level, like pulling a rubber band too tight, the rocks will suddenly break and slip to a new position. Scientists measure how much strain accumulates along a fault (斷層) each year, how much time has passed since the last earthquake, and how much strain was released in the last earthquake. This information is used to calculate the time required for the accumulating strain to build to the level that results in an earthquake. This simple model is so complicated that such detailed information about faults is rare. In the United States, only the San Andreas Fault System has adequate records for using this prediction method.
Scientific understanding of earthquakes is of vital importance to the Nation. As the population increases, expanding urban development and construction encroach (侵蝕) upon areas susceptible(易受影響的) to earthquakes. With a greater understanding of the causes and effects of earthquakes, we may be able to reduce damage and loss of life from this destruction.
【小題1】What does the passage mainly talk about?

A．What an earthquake is like.

B．How to predict earthquakes.

C．Where earthquakes often happen.

D．When a fault is formed.

【小題2】That scientists study the history of large earthquakes in certain areas is to ultimately_________.

A．do research on the past frequency of large earthquakes

B．estimate the magnitude of similar earthquakes

C．forecast the possibilities of similar earthquakes

D．judge the specific location of future earthquakes

【小題3】Which is TRUE according to the passage?

A．There were four magnitude 6 earthquakes in the San Francisco Bay region between1979 and1989.

B．The accumulating strain of the fault to a certain level results in the earthquake.

C．About 68 years after 1911, no earthquakes occurred in the San Francisco Bay region.

D．The fast increasing population on the earth is the main cause of the earthquake.

【小題4】What is the critical factor of forming a fault?

A．The material of rocks.

B．The existing time span of the rocks.

C．The plate movements around the rocks.

D．The amount of strain released in the last earthquake.

【小題5】According to the passage, we can know that the San Andreas Fault System____.

A．has a greater understanding of the causes and effects of earthquakes

B．stores much more information about the history of large earthquakes

C．offers the potential for doing research on the faults where strain accumulates

D．illustrates specifically how rocks along a fault are formed

The goal of earthquake prediction is to give early enough warning. The U.S. Geological Survey conducts and supports research on the likelihood of future earthquakes. Scientists estimate earthquake probabilities in two ways: by studying the history of large earthquakes in a special area and the rate at which strain（拉力）accumulates（積累）in the rock.

Scientists study the past frequency of large earthquakes in order to determine the future likelihood of similar large shocks. For example scientists researched the large earthquakes in the San Francisco Bay region during the 75 years between 1836 and 1911. For the next 68 years, no earthquakes of magnitude (震級(jí)) 6 or large occurred in the region. Beginning with a magnitude 6 shock in 1979, the earthquakes in the region increased dramatically; between 1979 and 1989, there were four magnitude 6 or greater earthquakes, including a magnitude 7.1 earthquake. So scientists estimated that the probability of a magnitude 6.8 or larger earthquake occurring during the next 30 years in the region is about 67 percent.

Another way to predict earthquakes is to study how fast strain accumulates. When plate movements build the strain in rocks to a critical level, like pulling a rubber band too tight, the rocks will suddenly break and slip to a new position. Scientists measure how much strain accumulates along a fault (斷層) each year, how much time has passed since the last earthquake, and how much strain was released in the last earthquake. This information is used to calculate the time required for the accumulating strain to build to the level that results in an earthquake. This simple model is so complicated that such detailed information about faults is rare. In the United States, only the San Andreas Fault System has adequate records for using this prediction method.

Scientific understanding of earthquakes is of vital importance to the Nation. As the population increases, expanding urban development and construction encroach (侵蝕) upon areas susceptible(易受影響的) to earthquakes. With a greater understanding of the causes and effects of earthquakes, we may be able to reduce damage and loss of life from this destruction.

1.What does the passage mainly talk about?

A．What an earthquake is like.

B．How to predict earthquakes.

C．Where earthquakes often happen.

D．When a fault is formed.

2.That scientists study the history of large earthquakes in certain areas is to ultimately_________.

A．do research on the past frequency of large earthquakes

B．estimate the magnitude of similar earthquakes

C．forecast the possibilities of similar earthquakes

D．judge the specific location of future earthquakes

3.Which is TRUE according to the passage?

A．There were four magnitude 6 earthquakes in the San Francisco Bay region between1979 and1989.

B．The accumulating strain of the fault to a certain level results in the earthquake.

C．About 68 years after 1911, no earthquakes occurred in the San Francisco Bay region.

D．The fast increasing population on the earth is the main cause of the earthquake.

4.What is the critical factor of forming a fault?

A．The material of rocks.

B．The existing time span of the rocks.

C．The plate movements around the rocks.

D．The amount of strain released in the last earthquake.

5.According to the passage, we can know that the San Andreas Fault System____.

A．has a greater understanding of the causes and effects of earthquakes

B．stores much more information about the history of large earthquakes

C．offers the potential for doing research on the faults where strain accumulates

D．illustrates specifically how rocks along a fault are formed