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The Environment and HumanityMan did not have to think about the protection of his environment. There were few people on the earth, and natural resources seemed to be unlimited.
Today things are different. The world has become too crowded. We are using up our natural resources too quickly, and at the same time we are polluting out environment with dangerous chemicals. If we continue to do this, human life on earth will not survive.
Everyone realizes today that if too many fish are taken from the sea, there will soon be none left. Yet, with modern fishing methods, more and more fish are caught. We know that if too many trees are cut down, forests will disappear and nothing will grow on the land. Yet, we continue to use bigger and more powerful machines to cut down more and more trees.
We realize that if rivers are polluted with waste products from factories, we will die. However, in most countries waste products are still put into rivers or into the sea, and there are few laws to stop this.
We know, too, that if the population of the world countries is to rise at the present rate, in a few years, there will not be enough food. What can we do to solve these problems?
If we eat more vegetables and less meat, there will be more food available for everyone. Land that is used to grow crops feeds five times more people than land where animals are kept.
Our natural resources will last longer if we learn to recycle them.
The world population will not rise so quickly if people use modern methods of birth control.
Finally, if we educate people to think about the problems we shall have a better and clean planet in the future.
（1）Today, we have to think about the protection of our environment because ________.
[ ]
A. things are getting worse and worse
B. the limited natural resources are being used up quickly
C. the environment is continuing to be polluted by too much waste and poison
D. if we care nothing about the protection of the environment, no human beings will exist on earth
（2）If we ________, the natural resources can be used longer.
[ ]
A. use them as little as possible
B. use them properly and pay attention to the recycle
C. make full use of them
D. learn to recycle them
（3）Which of the following statements is NOT true?
[ ]
A. If we eat more vegetables, more food can be saved.
B. In the past, there was no need for us to think about the environmental protection.
C. If we keep on cutting down trees, forests will disappear, and nothing will grow on land.
D. We should not take more and more fish out of the sea, or there will soon be no fish left.
（4）In order to slow down the increase of the world population, _______.
[ ]
A. we should encourage young people to marry later
B. we should encourage the married to use modern methods of birth control
C. we should let the people have more education
D. both A and B
（5）According to the passage, the most important things we must understand is that _______.
[ ]
A. we should keep our environment from being polluted
B. we must make enough laws to protect our natural resources
C. man will destroy himself if he doesn't solve the problems mentioned in the passage
D. we will have not enough food if the population of the world countries rises at the present
查看习题详情和答案>>阅读理解
The Environment and HumanityMan did not have to think about the protection of his environment. There were few people on the earth, and natural resources seemed to be unlimited.
Today things are different. The world has become too crowded. We are using up our natural resources too quickly, and at the same time we are polluting out environment with dangerous chemicals. If we continue to do this, human life on earth will not survive.
Everyone realizes today that if too many fish are taken from the sea, there will soon be none left. Yet, with modern fishing methods, more and more fish are caught. We know that if too many trees are cut down, forests will disappear and nothing will grow on the land. Yet, we continue to use bigger and more powerful machines to cut down more and more trees.
We realize that if rivers are polluted with waste products from factories, we will die. However, in most countries waste products are still put into rivers or into the sea, and there are few laws to stop this.
We know, too, that if the population of the world countries is to rise at the present rate, in a few years, there will not be enough food. What can we do to solve these problems?
If we eat more vegetables and less meat, there will be more food available for everyone. Land that is used to grow crops feeds five times more people than land where animals are kept.
Our natural resources will last longer if we learn to recycle them.
The world population will not rise so quickly if people use modern methods of birth control.
Finally, if we educate people to think about the problems we shall have a better and clean planet in the future.
（1）Today, we have to think about the protection of our environment because ________.
[ ]
A. things are getting worse and worse
B. the limited natural resources are being used up quickly
C. the environment is continuing to be polluted by too much waste and poison
D. if we care nothing about the protection of the environment, no human beings will exist on earth
（2）If we ________, the natural resources can be used longer.
[ ]
A. use them as little as possible
B. use them properly and pay attention to the recycle
C. make full use of them
D. learn to recycle them
（3）Which of the following statements is NOT true?
[ ]
A. If we eat more vegetables, more food can be saved.
B. In the past, there was no need for us to think about the environmental protection.
C. If we keep on cutting down trees, forests will disappear, and nothing will grow on land.
D. We should not take more and more fish out of the sea, or there will soon be no fish left.
（4）In order to slow down the increase of the world population, _______.
[ ]
A. we should encourage young people to marry later
B. we should encourage the married to use modern methods of birth control
C. we should let the people have more education
D. both A and B
（5）According to the passage, the most important things we must understand is that _______.
[ ]
A. we should keep our environment from being polluted
B. we must make enough laws to protect our natural resources
C. man will destroy himself if he doesn't solve the problems mentioned in the passage
D. we will have not enough food if the population of the world countries rises at the present
查看习题详情和答案>>Fifteen percent of US teenagers aged 12 to 17 who own mobile phones have received nude（裸体）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(立法机关) have stepped in to consider laws that would downgrade charges from felonies（重罪） to misdemeanors（轻罪）.
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
查看习题详情和答案>>Fifteen percent of US teenagers aged 12 to 17 who own mobile phones have received nude（裸体）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(立法机关) have stepped in to consider laws that would downgrade charges from felonies（重罪） to misdemeanors（轻罪）.
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
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