Read the following article and select the best answer. Article: Have you wondered about the amount of time we spend talking about food and been surprised? We are always asking questions such as "Have you ever eaten?" and "What did you have for lunch?"Yet, if you travel from one country to another, you might find that other nations think differently about food. People plan to think that what they eat is normal and what everyone else eats is strange. In most parts of Asia, for example, no meal is complete without rice but in England, rice is the exception and people prefer to eat potatoes, in the Middle East, bread accompanies every meal. Eating, like so many things we do, becomes a habit that is difficult to change. The Americans seem to like drinking lots of orange juice and coffee; the English prefer to drink tea four or five times a day; the Australians prefer to drink a lot of beer; the French, like wine every day. People in different countries also like eating different kinds of meat and even within countries, different regions will have different likes and dislikes, especially in large countries like China and the former Soviet Union. In Hong Kong and the south of China, some people enjoy eating snakes but in the north of China, most people refuse to eat them. The French think that horse meat is delicious but most English people are terrified at the thought of eating it. The New Zealanders eat a lot of lamb and mutton, but never goat. The Japanese say that they do not like eating lamb and mutton because of their smell, but that they really enjoy eating raw fish more than anything else. So it seems that there is often very little common sense about what is nicest to eat or drink in different parts of the world although we may talk on the subject of food for hours. However, as people everywhere enjoy eating what they have always eaten, there seems very little point in trying to change traditional eating habits. Question: The topic people spend a lot of time talking about is _ . - lunch - breakfast - dinner - food
food

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Read the following article and select the best answer. Article: In American crime movies, policemen search crime scenes for anything that might belong to a criminal-- bits of fingernail , blood or hair-- in order to find out who they are. What they hope to find is the key to their identity--their DNA. DNA is the chemical that contains a person's genetic makeup. Every person, except for identical twins, has unique DNA information. That is why we can use it to identify someone. There is no doubt that DNA evidence is becoming a very powerful tool for law enforcement officers. In the US, all 50 states and the federal government keep DNA databases of some criminals after they have been convicted . Whenever a crime happens, the police collect DNA from the crime scene and compare this with samples they already have in the criminal database. If they match any suspect in the database, then they've caught their criminal. Even if they don't, the DNA sample can still be used to determine the person's sex, height, hair and eye color1 and other characteristics. This helps police to create a physical profile of the criminal. Some people feel that the database should be made bigger to contain everyone's DNA and help to solve many more crimes. This would also avoid mistakes when someone is wrongly convicted of a crime. DNA doesn't make mistakes. However, other people are worried that it would violate their privacy. Someone's DNA can be used to gather information such as the person's family and ethnic background, whether he or she has a gene mutation or certain genetic diseases, and other personal issues. People are afraid that this information might be used inappropriately. They may fear that employers might read it and treat them differently. People may also be afraid that personal data might get into the hands of insurance firms or loan companies. For example, if they knew from your DNA that you had a genetic risk of a serious disease, they might be able to refuse you life insurance, a loan, or even a job. Clearly, the use of DNA evidence will continue to help the police solve... Question: What is the article mainly about? - The possibilities opened up by DNA technology - The controversy over DNA databases - How DNA databases are built - What role DNA plays in solving crimes.
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The controversy over DNA databases

Read the following article and select the best answer. Article: Sometimes,you just can't help it.Maybe you're watching a sad movie,or thinking about the friend who moved away.Next thing you know,your eyes are watering,and you have tears running down your cheeks.Why do people cry when they are emotional? What are tears? Scientists are working hard to find the answers to these questions. Ad Vingerhoets is a professor of psychology at Tilburg University,in the Netherlands.He is one of the few scientists in the world who have studied crying.According to Vingerhoets,there are three types of tears.Basal tears are the first type.They lubricate the eyes and act as a protective barrier between the eye and the rest of the World.Next are reflex tears.They wash your eyes clean when something gets in them.Finally,there are emotional tears. "These are released in response to emotional states,"explains Vingerhoets."Especially when we feel helpless." Scientists believe that crying has something to do with how humans developed and learned to depend on each other."Humans are very complex social creatures,"says Lauren Bylsma,a professor at the University of Pittsburgh,in Pennsylvania."It seems that tears serve to arouse help and support from others,''She says."Another reason we weep is that humans have the longest developmental period of almost any animal.It takes a long time to grow up." Vingerhoets agrees."I think that the reason why humans shed tears has something to do with our childhood,"he says."That's the time when we are stir dependent on adults for love and protection and care.The major advantage of emotional tears is that you can target them at a specific person."Vingerhoets says this ability to target someone could have come in hand in prehistoric times,when humans were living among dangerous animals.Crying could attract predators .Tears were a safer way to get attention.In this case,it is better to use a silent signal to ask for help,"he says. Vingerhoets and Bylsma do frequent studies to better understand why humans cry.According to Byhma,there is still much more to... Question: What's the function of tears according to Bylsma? - It helps human develop longer. - It helps humans attract predators. - It helps arouse attention. - It helps people to be independent.
It helps arouse attention.