(Question)
Scratchy throats, stuffy noses and body aches all spell misery, but being able to tell if the cause is a cold or flu may make a difference in how long the misery lasts. The American Lung Association (ALA) has issued new guidelines on combating colds and the flu , and one of the keys is being able to quickly tell the two apart. That's because the prescription drugs available for the flu need to be taken soon after the illness sets in. As for colds, the sooner a person starts taking over-the-counter remedy, the sooner relief will come. The common cold and the flu are both caused by viruses. More than 200 viruses can cause cold symptoms, while the flu is caused by three viruses - flu A, B and C. There is no cure for either illness , but the flu can be prevented by the flu vaccine, which is, for most people, the best way to fight the flu, according to the ALA. But if the flu does strike, quick action can help. Although the flu and common cold have many similarities , there are some obvious signs to look for. Cold symptoms such as stuffy nose, runny nose and scratchy throat typically develop gradually, and adults and teens often do not get a fever. On the other hand, fever is one of the characteristic features of the flu for all ages. And in general, flu symptoms including fever and chills, sore throat and body aches come on suddenly and are more severe than cold symptoms. The ALA notes that it may be particularly difficult to tell when infants and preschool age children have the flu. It advises parents to call the doctor if their small children have flu-like symptoms. Both cold and flu symptoms can be eased with over-the-counter medications as well. However, children and teens with a cold or flu should not take aspirin for pain relief because of the risk of Reye syndrome ,a rare but serious condition of the liver and central nervous system. There is, of course, no vaccine for the common cold. But frequent hand washing and avoiding close contact with people who have colds can reduce the likelihood of catching one. If children have flu-like symptoms, their parents _ . A) are advised not to give them aspirin B) should watch out for signs of Reye syndrome C) are encouraged to take them to hospital for vaccination D) should prevent them from mixing with people running a fever
(Answer)
A

(Question)
Social networking websites are causing alarming changes in the brains of young users, a famous scientist has warned.Sites such as Facebook, Twitter and Bebo are said to shorten attention spans , encourage instant satisfaction and make children more self-centered. Warnings from neuroscientist Susan Greenfield will disturb the millions whose social lives depend on surfing their favorite websites each day.But they will strike a chord with parents and teachers who complain that many teenagers lack the ability to communicate or concentrate away from their screens. More than 150 million use Facebook to keep in touch with friends, share photographs and videos and post regular updates of their movements and thoughts.A further six million have signed up to Twitter, the "micro-blogging" service that lets users exchange text messages about themselves.But while the sites are popular and extremely profitable, a growing number of psychologists and neuroscientists believe they may be doing more harm than good. Baroness Tarot, an Oxford University neuroscientist believes repeated exposure could rewire the brain.Computer games and fast-paced TV shows were also a factor, she said."My fear is that these technologies are weakening the brain to the state of small children who are attracted by buzzing noises and bright lights, who have a small attention span and live for the moment." "I often wonder whether real conversation in real time may eventually give way to these easier and faster screen dialogues, in much the same way as killing and butchering an animal to eat has been replaced by the convenience of packages on the supermarket shelf," she said. Psychologists have also argued that digital technology is changing the way we think.They point out that students no longer need to plan their term papers before starting to write--thanks to word processors they can edit as they go along. A study by the Broadcaster Audience Board found teenagers now spend seven and a half hours a day in front of a screen.Educational psychologist... A neuroscientist may worry that sites like Facebook may _ . A) help children learn to make real relationships with people in society B) encourage students not to plan their term papers before starting to write C) disturb those whose social lives depend on surfing their favorite websites D) make real conversation in real time give way to easier and faster screen dialogue
(Answer)
D

(Question)
The Internet is not perfect. There are many problems with it. The Internet is not organized. There is no one in charge of the Internet. It is sometimes difficult to find what you are looking for. It is also easy to get the wrong information on the "Net". Some businessmen cheat people on the Internet. Internet thieves can steal credit card numbers. Some advertisers send spam to e-mail boxes. E-mail boxes are often filled with these unwanted advertisements. Illegal businesses can operate on the Internet. These businesses sell X-rated materials, cigarettes and alcohol to teenagers. The Internet has websites with information about making bombs, breaking the law and terrorism. Criminals can fool people, especially children, in chat rooms. They can spread poisonous information and attack new members. The Internet is the greatest advance in communication since human emerged. But it can also like a dark alley in a dangerous part of town. Parents need to set parental controls on their children when they use the Internet. This will keep some of the bad material away from their children. The Internet can be dangerous to computers, too. Some people who have evil intentions enjoy causing problems for other people they don't even know. They create computer viruses. A computer can get virus by downloading a program that has a virus in it. Some virus come by e-mail. A virus can destroy the data a person has saved in computer files. A virus can cause a computer to crash. A virus can also reproduce itself! It can send copies of itself to everyone on a person's e-mail address list. Then these people's will have the same problems and can't work normally! We can infer from the passage that the key to solving the problems with the Internet is _ A) to improve the computers B) to find a medicine to kill computer viruses C) to order people not to use the Internet D) to improve people's moral level .
(Answer)
D