Read the article and select the best answer. Article: Scientists from England's Newcastle University have discovered that bacteria have the ability to detect smells, according to a study by the university on Sunday. The team of scientists, led by Dr. Reindert Nijland, discovered that bacteria can detect certain types of smell- producing chemicals, including ammonia that is produced by other bacteria. Once they sense the smells from other kinds of bacteria, the bacteria will gather together to form a colony and form a layer of slime in order to force the competitors out of their area. The response decreases as the distance between the two bacterial colonies increases. That slime, also known as biofilm, is one of the primary causes of infection on many medical implants . Biofilms also slow down ships and are believed to cost the marine industry millions of dollars annually. However, they can also be used to clean up spilled oil floating on the sea, as they grow strong on it. "This is the first evidence of a bacterial 'nose'able to detect potential competitors," Dr. Nijland said in the August 15 statement, which confirms that bacteria possess qualities similar to four of the five senses that humans enjoy (sight, hearing, touch, taste, and smell), the others being touch, taste, and sight. "The fact that bacteria formed slime when exposed to ammonia has important significance for understanding how biofilms are formed and how we might be able to use them to our advantage," he added. Their findings were published in Sunday's edition of biotechnology journal, and could change the way scientists look at how each of the senses developed over time. "It was thought for a long time that smell existed only in complex living creatures," Dr. Nijland said. "Now we see that bacteria are able to do the same, so the indication is that the ability may have developed even earlier." Question: Which of the following describes bacteria correctly? Options: A: They can talk. B: They cannot see C: They cannot hear. D: They can imitate others.
C

Read the article and select the best answer. Article: As for older people, some of the applications are hard to use because they didn't grow up with them. They don't have simple models of how it should work. They don't know what to do when it doesn't work. I think there is huge potential, so I have designed some for them. The ability to connect to friends, who remember the same movies, news and music, is really important, especially as people get older. They end up in retirement homes and they aren't always close to their friends. Allowing the network to help them connect with friends and family members is a really powerful thing. My wife likes using the Internet, although it took me years to get her to use e-mail. She was born with normal hearing, but lost it when she was three years old. She was totally deaf for many years until 53 when she got ear implants .They work really well. That is a big change for her. Before then, her friends couldn't call her on the phone, so they insisted that she use e-mails to communicate with them. The younger people don't even think of this as technology. It's just there, and they use it .There's been a very interesting change in communication styles between the old and the young .A woman named Sharryturkle wrote about this phenomenon .There are some kids who are now in their teens and are tending not to make phone calls. And they think of e-mail as old-fashioned and slow. The reason why teens don't make phone calls seems to be that they don't know what to say. When they call they often pause for a while. On the other hand, texting is considered proper, and it's OK if you don't answer. You might have been distracted .It's not considered rude, but it's considered unusual if you're in this kind of voice conversation and simply stop talling. Question: What is the best way for the teens to communicate with others? Options: A: Sending e-mail. B: Making phone call. C: Writing letters. D: Sending text messages.
D

Q: Read the article and select the best answer. Article: There was a Bulgarian boy who was an exchange student in the USA. He lived with an American family. One day, he went to his room in the evening, and did his homework. His host-mom came to him and asked if he would like to go along to the movies. He wanted to go, so he shook his head from side to side, said "Yes". His host-mom did a couple of steps back, and looked puzzled. She thought that he didn't want to go out because he shook his head from side to side. However, he wanted to go out to the movies. Bulgarians shake their heads from side to side when they mean "yes". People in other countries shake their heads from side to side when they mean "no". Gestures can have different meanings according to different cultures. For example, in America, putting your index finger and your thumb in a circle is commonly used as an OK sign that means everything is all right. However, in France, that sign is used to express "nothing" or "zero", which can have a negative meaning. Generally speaking, gestures are a type of communication that uses a part of our body, and when speaking with people from other cultures, gestures can be important keys or clues to understand them. However, we need to understand that those gestures vary from culture to culture, and it is necessary for us to have an open mind in understanding the different gestures. Question: Why did the Bulgarian boy shake his head from side to side? Options: A: He thought it rude of him to go with the family. B: He didn't understand what the host-mom said. C: He changed his mind after saying "Yes." D: He wanted to go out to the movies.
A: D

Read the article and select the best answer. Article: Teens are more likely to behave badly if their parents expect them to,a new US study has found. "Parents who believe they are simply being realistic might actually be having a bad effect on their children," Christy Buchanan,a teacher at Wake Forest University and one of the authors of the study,said. "Bad expectations on the part of both parents and children predict more rebellious behaviors later on." The finding came from a study of more than 250 sixth and seventhgraders and their mothers. They were examined at the start of the study and again one year later. If kids' mothers expected them to take more risks and be more rebellious,higher chances of risky behavior were seen. _ _ _ when kids had bad expectations of themselves. "Sometimes parents expect more negative behavior from their children than they should based on the children's history of behavior," Buchanan said.Parents shouldn't be naive about the possibility of bad behavior,she said,but it's also a mistake to think that children who are wellbehaved will naturally become rebellious at the age of 13. "By thinking risktaking or rebelliousness is normal for teenagers and showing that to their children,parents might add to other messages from society that make teenagers feel that they are strange if they are not willing to take risks or break laws," she said."This can mean,for example,that when parents expect teens to drink before they turn 21 or to do other risky behaviors,kids are less likely to refuse to do so later in their lives." On the other hand,parents' expectations that teens can exhibit good behaviors and refuse to behave badly or to take risks could help reduce the possibility of bad behavior,Buchanan said."As a parent,you should put expectations on your children carefully." Question: The passage is centered around the topic of _ . Options: A: parental rights B: children's habits C: parental education D: parentchildren relationship
C