Squirrels often communicate with whistles, chirps and chucks, which sound like the word "chuck". Whistles and chirps are like the sounds that many birds make.Now scientists have translated some of their squirrel-speak. Hare, a professor of zoology at the University of Maniloha in Winnipeg, and his team managed to record squirrels' alarm calls.The researchers studied the sounds and then played them back to 60 wild squirrels, which the scientists approached individually with a video recorder to capture their reponses.Some squirrels lifted their heads up and became.Alert .Creatures that were more frightened simply ran for their lives and dived into caves. "In effect then, whistles that mix with chucks say 'there's an enemy of average threat that's here', and whistles without chucks say 'there's an enemy of seemingly average threat around here somewhere', while pure chirps say, 'I'm hiding here because there's an immediate danger.' " Hare told.Discovery News. Hare and some other researchers believe such sounds arc part of an advanced language that develops just as all other communication systems. Although squirrels risk their lives when they call out to warn others of threats, other squirrels might admire this behaviour, thus increasingly the caller's social status, like humans who look up to heroes. Hare added that other animals, such as birds, probably understand at least some squirrel language, since they also may benefit from the alarm calls. In fact, another Canadian study found that deep-voiced, black-capped chickadees have their own language too.According to certain research, there are a lot of tidings in chickadees' calls, such as directing fellows' activities, keeping in contact between mates, and raising alarms. While chickadees and other birds are often welcomed into gardens by homeowners, squirrels are frequently viewed as pests . Hare wishes a greater understanding of the complex social lives and communication systems of squirrels will provide "hope that humans will gain a greater appreciation and... The text mainly talks about A) the study on the language of squirrels B) the comparison between squirrels and chickadees C) the calling for the protection of squirrels D) the ways for squirrels to escape from their enemies
A

Two men dressed as police officers stole about $200 million worth of art from the Isabella Stewart Gardner Museum early this morning. The two burglars knocked on a side door of the museum at about 1:15 am. They told the two security guards on duty that there was a disturbance in the area. The guards then made the very serious mistake of allowing the two men to go into the building. After they went in, the two burglars tied the guards up with tape. The two men stole 11 paintings and an ancient Chinese vase. The stolen works included three paintings by Rembrandt. A maintenance worker discovered the two guards at about 7 am and called police. One of the greatest losses was Rembrandt's works, "The Storm on the Sea of Galilee." It was a very popular attraction at the museum and was one of the most valuable works stolen. Museum officials said that the value of the stolen art is at least 200 million dollars, and may in fact be much more. The true value of the paintings is unknown, because they have not been on the market for nearly a century. This is considered to be the biggest theft ever in the United States. Officials are waiting to see whether the burglars will or try to sell them to a private collector. Museum officials and police are not sure why the burglars chose certain works and not others. There are other paintings in the museum that are even more valuable than the ones that were stolen. Special investigators are looking into the theft and the museum's security system. They believe that this is a "professional job," because the people involved were well prepared and knew what they wanted. How did the two burglars get into the museum? A) They broke into the museum. B) They had the key to the museum. C) They tied the guards up with tape. D) The security guards opened the door for them.
D

One of my longest-running battles with my kids is about manners specifically,about whether it's necessary to send hand-written thank-you notes for gifts.I say yes,and my children have continued throughout their teens to write the notes.But they grumble that I'm out of step with the times. If a new BabyCenter poll is any guide, _ .A surprisingly large number of parents still insist that their children practice such old-fashioned manners as putting pen-to-paper to say thank you,treating adults with respect and addressing adults as "Mr., Mrs.or Miss."A majority of the 1,000 parents surveyed also said they insist at dinner that children keep napkins in their laps,ask to be excused from the table and refrain from talking with a full mouth. Among the reasons cited most often by parents,BabyCenter says,is that "the world is a more free-wheeling place,and they want to give their kids a stronger moral compass to guide them."This thinking was affirmed by 64%of those surveyed.And 58%say they see so many badly behaved kids around them that they're determined to raise their children differently. This poses a particular challenge for parents who work outside the home and must find a sitter, nanny or other child-care provider who will insist on the manners they consider most important. Pediatrician Perri Klass wrote recently in the New York Times about her annoyance at a rude,demanding child who was among her longtime patients.Although she veiled her injunctions to the mother in euphemisms ,talking to her about "setting limits,"Dr.Klass wrote,"I do pass judgment on kids with bad manners and so does every pediatrician I know."Rude kids make her wonder whether there is something wrong with the family,among other things,she says."The whole 'manners' concept might seem a bit odd,"she says,"until you recast it as 'social skills' a hot-button child-development issue,as I wrote in a recent column." Readers,what manners do you insist upon for your children? Has other kids' bad behavior led you to toughen your standards? Do the... are the right persons to attend to the children while the parents work outside. A) Those who do good cooking B) Those who ignore the good manners C) Those who focus on virtue D) Those who have a sense of humor
C