Carbon monoxide poisoning kills and injures many people and animals around the world. The gas has been a problem since people first began burning fuels to cook food or to create heat. It is a problem in all parts of the world that experience cold weather. Carbon monoxide is called the silent killer because people do not know it is in the air. The gas has no color1. It has no taste. It has no smell. It does not cause burning eyes. And it does not cause people to cough. But it is very deadly. It robs the body of its ability to use oxygen. Carbon monoxide decreases the ability of the blood to carry oxygen to body tissues. It does this by linking with the blood. When the gas links with the blood, the blood is no longer able to carry oxygen to the tissues that need it. Damage to the body can begin very quickly from large amounts of carbon monoxide. How quickly this happens depends on the length of time a person is breathing the gas and the amount of the gas he or she breathes in. Carbon monoxide poisoning has warning signs. But people have to be awake to recognize them. Small amounts of the gas will cause a person's head to hurt. He or she may begin to feel tired. The person may feel sick. The room may appear to be turning around. The person may have trouble thinking clearly. People develop severe head pain as the amount of gas continues to enter their blood. They will begin to feel very tired and sleepy. They may have terrible stomach pains. Medical experts say carbon monoxide affects people differently. For example, a small child will experience health problems or die much quicker than an adult will. The general health of the person or his or her age can also be important. An older adult with health problems may suffer the effects of carbon monoxide more quickly than a younger person with no health problems. People with heart disease may suffer chest pains. They may begin to have trouble breathing. When people breathe in small amounts of the gas, they may _ . A) feel a little dizzy B) suffer a severe headache C) go around in the room D) have a terrible stomachache
A
(Question)
A new report said scientists may not be far from giving apes the ability to think and talk like humans. The report is about experiments which transplant human cells into animals for medical purposes. It claimed that concerns about the creation of talking apes should be taken seriously. It should also draw people's attention to the possibility that the medical research about creating "humanised" animals is going to generate monsters. A regulatory body is needed to closely monitor any experiments that many risk creating animals with human-like consciousness or giving them any appearance or behavioural traits that too closely resemble humans, the report said. Scientists would, for example, be prevented from replacing a large number of an ape's brain cells with human brain cells until more is known about the potential risks. This has already been done in simpler animals like mice, which is judged to be less risky. Under the new UK guidelines, the power to regulate tests on animals containing human material would be transferred to a body with wider responsibility for animal testing in the Home Office. While there is no risk from experiments currently being carried out in Britain, it is possible that ethical boundaries could be crossed within the next few years if scientists are not careful, the experts said. Professor Thomas Baldwin, a member of the Academy of Medical Sciences working group that produced the report, said the possibility of humanised apes should be taken seriously. He said, "The fear is that if you start putting very large numbers of human brain cells into the brains of primates you might transform the primates into something that has some of the abilities that we regard as distinctly human, such as speech, or other ways of being able to _ or relate to us." Professor Martin Bobrow, chair of the academy working group that produced the report, said, "The very great majority of experiments present no issues beyond the general use of animals in research and these should continue to proceed under the... It can be inferred that _ . A) people should be careful when creating talking apes B) Thomas Baldwin and Lord Willis are from the same organization C) creating humanised animals is difficult in Britain now D) scientists must be cautious not to cross ethical boundaries
(Answer)
D
What do those countries have in common? People are killing each other or drive others out of their homes. Why is this happening? Very simple, in each of these, one group of people believes another group is different from them and dangerous to them. It has been thus through history. How different are humans from each other? We come in different colors: red, black, white, yellow and brown; we have a variety of political systems, social systems, religious views or none at all; We are different in mind, have different educational systems, different economic classes. We speak different languages, and have different customs and dresses. If we were to break each of these further, we would have quite a long list of qualities and characteristics that make humans appears to be different from each other. I say they appear to be different, because most of what have been listed stand for what we see or hear, not what is true of human. Man is man everywhere. It is only where he lives, when he lives there, with whom he lives there, and al the others that have effect on how he lives, that is, what he believes, what he wears, his customs, his language and so on. These are man-made facts that each group develops over tome, living together, facing the same problems, needing and desiring the same things. They are his culture. The truth is that we are much more same than different. If you wear one type of clothing and I wear another, we both wear some kind of clothing. Our culture demands it. If you speak one language and I another, we both speak so that others will understand us; we must communicate with each other. Nothing is gained by giving too many differences, but much is lost. If we understood our differences as the ones of culture, then we could make our world more peaceful. Differences does not mean better or worse, right or wrong. It means only that differences have been made by society. Differences produce variety of thoughts, work out human problems peacefully. If you pay much attention to differences, _ . A) we will get something. B) we will produce problem. C) we will develop further. D) Nothing will be lost.
B