In today's world, we rely on computers as never before.They are used for everything from ordering a pizza to running hospitals and military defense systems.Banking and credit card information is stored and accessed by computers.So what happens when a computer gets infected with a virus? One effect is that people's access to their e-mail accounts is cut off.A more serious possible consequence is that billions of dollars could be lost. A virus is a computer program that copies itself onto other programs and infects them. Similar to an easily spread disease, a computer virus goes from computer to computer, either adding to or changing the tasks a program is designed to do. The first computer viruses were created in the mid '80s and had varying effects.Some caused files to be deleted, or made the letters on the screen appear to fall off.Others displayed a specific message once the computer was turned on. Viruses today are much more widespread and dangerous than ever before.Perhaps the most damaging to date has been the "I Love You" virus."I Love You" appeared in May 2000 and has possibly been the most destructive virus in terms of monetary loss. The virus is released when an attachment to a fake e-mail message is opened.By changing the names of files on computers, "I Love You" makes them difficult to access.It also searches for important personal information, including passwords, which it sends to a web site for others to see. It is estimated that more than 45 million people in 20 countries have had their computers infected by the "I Love You" virus.Some say the cost of repair and lost business has been more than US$10 billion. If you own a computer, it is important to keep it in good health by installing an anti-virus program.If updated frequently, it will protect your e-mail access-not to mention your wallet. What is the purpose of the article? A) To warn us against virus. B) To remind us the importance of being healthy. C) To stress the importance of computer. D) To alert us to economic loss.
A
(Question)
Babies who watch TV are more likely to show late learning development and language at 14 months, especially if they are watching programs aimed at adults and older children, according to a new study, which would probably surprise those parents who leave their babies in front of a TV set. Babies who watched 60 minutes of TV daily had developmental scores a third lower at 14 months than babies who were watching less TV. Although their developmental scores were still in the normal range, the difference may have been due to the fact that when children and parents are watching TV, they are missing the talking, playing and other communications that are important to learning and development. This new study, which appeared in the Aechives of Pediatric and Adolescent Medicine, followed 259 lower-income families in New York, most of whom spoke Spanish as their primary language at home. Other studies of higher-income families have also come to the same conclusion: TV watching is not only non-educational, but it seems to slow down babies' development. But what about "good" TV, like Sesame Street? The researchers didn't find any difference when compared to non-educational programs designed for small children, like Spongebob SquarePants. Earlier research by some of the same scientists, most of whom are at New York University School of Medicine's Bellevue Hospital Centre, has found that parents whose children watch non-educational TV programs like Spongebob SquarePants spend less time reading to their children or teaching them. At this point, parents reading this will probably be astonished. TV is so often a parent's good friend, keeping children happily occupied so that the adults can cook dinner, answer the phone, or take a shower. But, clearly, this electronic babysitter is not an educational aid. It is best to make sure the babies are fast asleep if you have to watch TV. Babies who watched 60 minutes of TV daily had lower developmental scores perhaps because _ . A) they watch non-educational programs B) they have little communication with their parents C) they lost interest in real things D) their parents don't speak English at home
(Answer)
B
Ques: Feel tired lately? Has a doctor said he can't find anything wrong with you? Perhaps he sent you to a hospital, but all the advanced equipment there shows that there is nothing wrong with you. Then , consider this: you might be in a state of sub - health . Sub - health, also called the third state or gray state, is explained as a borderline state between health and disease. According to the survey by the National Health Organization, Over 45 percent of sub - healthy people are middle-aged or elderly. The percentage is even higher among people who work in management positions as well as students around exam week. Symptoms include a shortage of energy, depression, slow reactions, insomnia and poor memory , Other symptoms include shortness of breath, sweating and aching in the waist and legs. The key to preventing and recovering from sub - health, according to some medical experts, is to form good living habits, ale mate work and rest, exercise regularly, and take part in open air activities. As for meals, people are advised to eat less salt and sugar . They should also eat more fresh vegetables, fruits, fish because they are rich in nutritional elements - vitamins and trace elements - that are important to the body. Nutrition experts point out that it is not good to eat too much at one meal because it may cause unhealthy changes in the digestive tract . They also say that a balanced diet is very helpful in avoiding sub - health. As for food, experts suggested that _ . A) we should never eat meat B) we should have variety of food C) we should eat less than usual D) we should have meals without sugar
Ans: B
Question: The poaching ,or illegal killing,of rhinos in South Africa is growing worse each year.The government recently reported that a record number of rhinos were poached in 2015,a year which had more rhino killings in South Africa than ever before. The World Wildlife Fund,or WWF,says about 20, 000 rhinos live in South Africa. That is more than 80 percent of the rhinos in the world. Edna Molewa, South Africa's Environment Minister,says, "During 2015,we are sad to say this,1, 215 rhinos were killed.This is a rise in the number of poached rhinos from 1,004 in 2014 and indeed very worrying." The animals are hunted for their horns .Many people in Asia believe the horn has curing power, which drives poachers, at all costs, mad for more horns. But there is no scientific evidence for this belief.The horn is made of keratin .That is the same thing as human hair,fingernails and toenails. Ms.Molewa said 386 suspected poachers were arrested last year,an increase from the year before.But rhino protection workers say poachers often go unpunished after arrest. South Africa's legal system is ineffective. Ms. Mo1ewa said more needs to be done and South Africa is taking strong measures to protect rhinos.The efforts include moving some of the animals to secret places in neighboring countries. "Now approximately 100 rhinos have been moved to neighboring states in the SADC region during 2015 and 200 more rhinos will be moved this year," Molewa said. Jo Shaw,the rhino program manager at the WWF,said,"We're talking about a loss of a hundred rhinos a month,or more than three a day.We really need to see effective action not just at a national level but internationally." She says officials should find the criminal groups responsible for the poaching and punish them. Government officials are to meet in Botswana in March at the Inter-governmental Conference on Illegal Wildlife Trade. What is the main reason for people to hunt rhinos? A) To get more keratin. B) To protect the farmland. C) To use them for decoration. D) To make money from horns.
Answer:
D