Do you want to go out of town for a bit of rest and relaxation? Before you start packing, visit these best travel sites for vacationers. In my opinion, they help people deal with common problems that pop up during a trip.

Oyster.com

  Based on the advertised photos, the hotel you are considering appears to be clean and modern. Take a second look through the eyes of Oyster.com. Their representatives inspect resort areas and post the real images uncovering marketing lies. You see ACTUAL pictures of the rooms, attractions and beautiful beaches.

Skyscanner.net

  Are you planning to travel on a budget? Discover the best deals for flights, hotels and car rentals at Skyscanner.net. They offer reasonable and comprehensive travel comparison. The best part is that their services are free. You don’t have to sign up, provide personal information or go through a social network.

Virtualtourist.com

  Chat with someone other than a travel agent about a location. At Virtualtourist.com, fellow travelers and locals talk about their experiences in specific areas. This site is set up like a forum(论坛), so you can ask questions and get answers in the comfort of your own home. Find out where to eat, play and get pleasure in a place without getting food poison or robbed by criminals.

Travel.state.gov

  Unfortunately, Americans get into trouble abroad sometimes. Prepare for possible emergencies by visiting Travel.state.gov. There, the Bureau of Consular Affairs offers advice on how to handle the bad things that happen to good people in other countries. You learn what to do in the case of child abduction(绑架), a lost passport and illness. In addition, these officials post travel warnings regarding dangerous regions and why foreigners should avoid them.

  Are you ready to do your homework? Prepare for your departure by checking out these best travel sites for vacationers. Learn what you need to know now before walking out of the door.

68. What is the characteristic of Oyster.com?

   A. It offers you a lot of travel information.

   B. It tells tourists where the cheap hotels are.

   C. The photos on the site are really reliable.

   D. The representatives of Oyster.com are enthusiastic.

69. What is the biggest benefit of your visiting Skyscanner.net?

   A. You can accept their services for free.

   B. You can book the most modern hotels.

   C. You can make many friends through the social network.

   D. You can find the cheapest tour description and direction.

70. We can learn from this passage that _____.

   A. Virtualtourist.com gives you a chance to chat with a travel agent

   B. you’ll get answers to your travel questions at Virtualtourist.com

   C. the Bureau of Consular Affairs is in charge of Travel.state.gov

   D. if you lose your passport you’ll get help from Virtualtourist.com

Are you a social butterfly, or do you prefer being at the edge of a group of friends? Either way, your genes and evolution may play a major  1  , US researchers reported on Monday.

While it may come as no surprise that genes may help explain  2  some people have many friends and others have  3  , the researchers said, their findings go just a little farther than that.

"Some of the things we find are  4    uncommon," said Nicholas Christakis of Harvard University in Massachusetts, who helped   5  the study.

"We find that how interconnected your friends are   6   on your genes. Some people have four friends who know each other and some people have four friends who don't  7  each other.  8     Dick and Harry know each other depends on Tom's  9    ," Christakis said in a telephone interview.

Christakis and colleague James Fowler of the University of California San Diego are  10     known for their studies that show obesity, smoking and happiness spread in networks.

For this study, they and Christopher Dawes of UCSD used national data that   11   more than 1,000 identical(同卵的) and fraternal（异卵的） twins’ genes. Because  12  share an environment, these studies are good for showing the impact that genes have  13  various things, because identical twins  14  all their genes while fraternal twins share just half.

"We found there appears to be a genetic tendency to introduce your friends  15  each other," Christakis said.

There could be good, evolutionary reasons  16  this. People in the middle of a social network could be secret to useful gossip,  17   the location of food or good investment choices.

But they would also be at risk of catching effects from all sides -- in which case the advantage would  18   more cautious social behavior, they wrote in the Proceedings of the National Academy of Sciences.

"It may be that natural selection is  19  not just things like whether or not we can resist the common cold, but also who it is that we are going to come into  20   with," Fowler said in a statement.

(    ) 1. A. role                 B. rule           C. roll                  D. pole

(    ) 2. A. where              B. why          C. when                D. how

(    ) 3. A. a few                      B. several      C. few                  D. some

(    ) 4. A. generally          B. mainly      C. mostly              D. frankly

(    ) 5. A. conduct            B. introduce   C. conflict            D. instruct

(    ) 6. A. depends            B. bases         C. take                 D. put

(    ) 7. A. see                   B. inspect      C. learn                D. know

(    ) 8. A. When               B. Where       C. What                D. Whether

(    ) 9. A. genes                      B. brains        C. appearances      D. figures

(    ) 10. A. much             B. best           C. very                 D. least

(    ) 11. A. recorded         B. illustrated C. described          D. compared

(    ) 12. A. brothers          B. sisters        C. twins                D. cousins

(    ) 13. A. with                      B. on             C. for                   D. to

(    ) 14. A. share              B. have          C. own                 D. show

(    ) 15. A. into                B. to             C. in                    D. from

(    ) 16. A. for                 B. with          C. to                    D. at

(    ) 17. A. in addition to B. due to       C. as for                      D. such as

(    ) 18. A. lie on             B. bring in     C. lie in                D. send in

(    ) 19. A. acting on               B. putting on C. relying on         D. sending on

(    ) 20. A. contract          B. face          C. join                  D. contact

Are you a social butterfly, or do you prefer being at the edge of a group of friends? Either way, your genes and evolution may play a major  1  , US researchers reported on Monday.

While it may come as no surprise that genes may help explain  2  some people have many friends and others have  3  , the researchers said, their findings go just a little farther than that.

"Some of the things we find are  4    uncommon," said Nicholas Christakis of Harvard University in Massachusetts, who helped   5  the study.

"We find that how interconnected your friends are   6   on your genes. Some people have four friends who know each other and some people have four friends who don't  7  each other.  8     Dick and Harry know each other depends on Tom's  9    ," Christakis said in a telephone interview.

Christakis and colleague James Fowler of the University of California San Diego are  10     known for their studies that show obesity, smoking and happiness spread in networks.

For this study, they and Christopher Dawes of UCSD used national data that   11   more than 1,000 identical(同卵的) and fraternal（异卵的） twins’ genes. Because  12  share an environment, these studies are good for showing the impact that genes have  13  various things, because identical twins  14  all their genes while fraternal twins share just half.

"We found there appears to be a genetic tendency to introduce your friends  15  each other," Christakis said.

There could be good, evolutionary reasons  16  this. People in the middle of a social network could be secret to useful gossip,  17   the location of food or good investment choices.

But they would also be at risk of catching effects from all sides -- in which case the advantage would  18   more cautious social behavior, they wrote in the Proceedings of the National Academy of Sciences.

"It may be that natural selection is  19  not just things like whether or not we can resist the common cold, but also who it is that we are going to come into  20   with," Fowler said in a statement.

(    ) 1. A. role                 B. rule           C. roll                  D. pole

(    ) 2. A. where                  B. why          C. when               D. how

(    ) 3. A. a few                      B. several      C. few                  D. some

(    ) 4. A. generally          B. mainly      C. mostly              D. frankly

(    ) 5. A. conduct            B. introduce   C. conflict            D. instruct

(    ) 6. A. depends            B. bases        C. take                 D. put

(    ) 7. A. see                   B. inspect      C. learn               D. know

(    ) 8. A. When                   B. Where       C. What               D. Whether

(    ) 9. A. genes                      B. brains        C. appearances      D. figures

(    ) 10. A. much             B. best           C. very                 D. least

(    ) 11. A. recorded        B. illustrated C. described          D. compared

(    ) 12. A. brothers          B. sisters        C. twins               D. cousins

(    ) 13. A. with                      B. on             C. for                   D. to

(    ) 14. A. share              B. have          C. own                 D. show

(    ) 15. A. into               B. to             C. in                    D. from

(    ) 16. A. for                 B. with          C. to                    D. at

(    ) 17. A. in addition to B. due to       C. as for                      D. such as

(    ) 18. A. lie on             B. bring in     C. lie in               D. send in

(    ) 19. A. acting on               B. putting on C. relying on        D. sending on

(    ) 20. A. contract          B. face          C. join                  D. contact