Text 3
Under certain circumstances, the human body must cope with gases at greater-than-normal atmospheric pressure. For example, gas pressures increase rapidly during a dive made with scuba gear because the breathing equipment allows divers to stay underwater longer and dive deeper.
The pressure exerted on the human body increases by 1 atmosphere for every 10 meters of depth in seawater, so that at 30 meters in seawater a diver is exposed to a pressure of about 4 atmospheres. The pressure of the gases being breathed must equal the external pressure applied to the body, otherwise breathing is very difficult. Therefore all of the gases in the air breathed by a scuba diver at 40 meters are present at five times their usual pressure. Nitrogen, which composes 80 per cent of the air we breathe, usually causes a balmy feeling of well-being at this pressure. At a depth of 5 atmospheres, nitrogen causes symptoms resembling alcohol intoxication, known as nitrogen na
A. It forms bubbles.
B. It goes directly to the brain.
C. It is reabsorbed by the lungs.
D. It has a narcotic effect.
Text 3
Under certain circumstances, the human body must cope with gases at greater-than-normal atmospheric pressure. For example, gas pressures increase rapidly during a dive made with scuba gear because the breathing equipment allows divers to stay underwater longer and dive deeper.
The pressure exerted on the human body increases by 1 atmosphere for every 10 meters of depth in seawater, so that at 30 meters in seawater a diver is exposed to a pressure of about 4 atmospheres. The pressure of the gases being breathed must equal the external pressure applied to the body, otherwise breathing is very difficult. Therefore all of the gases in the air breathed by a scuba diver at 40 meters are present at five times their usual pressure. Nitrogen, which composes 80 per cent of the air we breathe, usually causes a balmy feeling of well-being at this pressure. At a depth of 5 atmospheres, nitrogen causes symptoms resembling alcohol intoxication, known as nitrogen na
A. yields
B. starts
C. surfaces
D. travels
Text 4
Anthropology is the study of human beings as creatures of society. It fastens its attention upon those physical characteristics and industrial techniques, those conventions and values, which distinguish one community from all others that belong to a different tradition.
The distinguishing mark of anthropology among the social sciences is that it includes for serious study more other societies than our own. For its purposes any social regulation of mating and reproduction is as significant as our own, though it may be that of the Sea Dyaks, and have no possible historical relation to that of our civilization. To the anthropologist, our customs and those of a New Guinea tribe are two possible social schemes for dealing with a common problem, arid in so far as he remains an anthropologist he is bound to avoid any weighting of one in favor of the other, lie is interested in human behavior, not as it is shaped by one tradition, our own, but as it has been
A. Human behavior.
B. Creatures of Society.
C. The Science of Custom.
D. The Functions of Cultures.
Text 2
Under pressure from animal welfare groups, two national science teachers associations have adopted guidelines that ban classroom experiments harming animals. The National Association of Biology Teachers and the National Science Teachers Association hope to end animal abuse in elementary and secondary schools and, in turn, discourage students from mishandling animals in home experiments and science fair projects.
Animal welfare groups are apparently most concerned with high school students experimenting with animals in extracurricular projects. Barbara Orlans, President of the Scientists’ Center for Animal Welfare, said that students have been performing surgery at random, testing known poisonous substances, and running other pathology experiments on animals without even knowing normal physiology.
At one science fair, a student cut off the leg and tail of a lizard to demonstrate that only the tail can regenerate, she said. In another cas
A. animal abuse is horrible and should be terminated.
B. the teachers have been compelled to do all animal experiments.
C. prohibition of experiments on animals will discourage students from being curious.
D. the international science and Engineering Fair will cease to operate because of the new policies.
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