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I'm taking a test and have to guess the right answer to the question after the article. Article: While some scientists overlook the existence of a sixth sense for danger, a new research from Washington University in St. Louis has discovered a brain area that clearly acts as an early warning system and helps us adjust our behavior to avoid dangerous situations. "Our brains are better at picking up not obvious warning signs than we previously thought," said Joshua Brown, a PhD in psychology in the issue of the journal Science. The findings offer exact scientific evidence for a new way to form a concept of the complex control processes taking place in and around the ACC, a brain area located near the top of the frontal lobes and along the walls that divide the left and right hemispheres . "In the past, we found activity in the ACC when people had to make a difficult decision, or after they make a mistake," Brown said. "But now we find that this brain area can actually learn to recognize when you might make a mistake, even before a difficult decision has to be made. So the ACC appears to act as an early warning system---- it learns to warn us in advance when our behavior might lead to a negative outcome, so that we can be more careful and avoid making a mistake." By providing a clearer picture by which we self monitor and control our behavior, the study is an important step in efforts to develop more effective treatments for mental illnesses. It also provides a new way of understanding inappropriate behaviors that often accompany mental illnesses. "Our results suggest how injury of the ACC can lead to breakdowns in the early warning system, so that the brain fails to stop or control inappropriate behavior ahead of time," said Brown. "On the other hand, in those persons with mental disorder, the ACC might warn us of an upcoming problem even when no problem is in the existence." Known to be an important part of the brain's control system, the ACC is believed to help adjust between cold, hard, fact-based reasoning and emotional responses, such as love, fear or expectation. Question: The new research helps us understand _ . Options: A: why we are likely to make mistakes when the ACC is badly injured B: why people with illnesses usually have so many strange behaviors C: how the ACC works when something dangerous happens D: how our brain warns us of failure in advance
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A

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I'm taking a test and have to guess the right answer to the question after the article. Article: Computer technology has become a major part of people's lives. This technology has its own special words. One example is the word mouse. A computer mouse is not a small animal that lives in buildings and open fields. It is a small device that you move around on a flat surface in front of a computer. The mouse moves the pointer on the computer screen. Computer expert Douglas Engelbart developed the idea for the mouse in the early 1960s. The first computer mouse was a carved block of wood with two metal wheels. It was called a mouse because it had a tail at one end. The tail was the wire that connected it to the computer. Using a computer takes some training. People who are experts are sometimes called hakers. A hacker is usually a person who writes software programs in a special computer language. But the word hacker is also used to describe a person who tries to steal information from computer systems. Another well-known computer word is Google. It is the name of a popular "search engine" for the Internet. People use the search engine to find information about almost any subject on the Internet. The people who started the company named it Google because in maths, google is an extremely large number. It is the number one followed by 100 zeros. When you "Google" a subject, you can get a large amount of information about it . Some people like to google their friends or themselves to see how many times their names appears on the Internet. If you Google someone, you might find that person's name on a blog. A blog is the shortened name for a Web log. A blog is a personal Web page. It may contain stories, comments, pictures and links to other Web sites. Some people add information to their blogs every day. People who have blogs are called bloggers. Blogs are not the same as spam. Spam is unwanted sales messages sent to your electronic mailbox. The name is based on a funny joke many years ago on a British television show, " Monty Python's Flying Circus". Some friends are at an eating place that only serves a... Question: Why is the small device called a mouse? Options: A: Because it was a carved block of wood. B: Because it has two metal wheels. C: Because it moves like a real mouse. D: Because it has a "tail" at one end.
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D

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I'm taking a test and have to guess the right answer to the question after the article. Article: Nuclear power's danger to health, safety, and even life itself can be summed up in one word: radiation. Nuclear radiation has a certain mystery about it, partly because it cannot be detected by human senses. It can't be seen or heard, or touched or tasted, even though it may be all around us. There are other things like that. For example, radio waves are all around us but we can't detect them, sense them, without a radio receiver. Similarly, we can't sense radioactivity without a radiation detector. But unlike common radio waves, nuclear radiation is not harmless to human beings and other living things. At very high levels, radiation can kill an animal or human being immediately by killing masses of cells in vital organs. But even the lowest levels can do serious damage. There is no levels of radiation that is completely safe. If the radiation does not hit anything important, the damage may not be serious. This is the case when only a few cells are hit, and if they are killed immediately. Your body will replace the dead cells with healthy ones. But if the few cells are only damaged, and if they reproduce themselves, you may be in trouble. They can grow into cancer. Sometimes this does not show up for many years. This is another reason for some of the mystery about nuclear radiation. Serious damage can be done without the victim being aware at the time that damage has occurred. A person can be irradiated and feel fine, then die for cancer five, ten, or twenty years later as a result. Or a child can be born weak as a result of radiation absorbed by its grandparents. Radiation can hurt us. We must know the truth. Question: What is the main idea of the passage? Options: A: How to detect nuclear radiation. B: How radiation kill a man. C: The mystery about nuclear radiation. D: Serious damage caused by nuclear radiation.
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C