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If you are like most people, your intelligence varies from season to season. You are probably a lot sharper in the spring than you are at any other time of the year. A noted scientist, Ellsworth Huntington (1876-1947), concluded from other men’s work and his own among peoples in different climates that climate and temperature have a definite effect on our mental abilities.He found that cool weather is much more favorable for creative thinking than is summer heat. This does not mean that all people are less intelligent in the summer than they are during the rest of the year. It does mean, however, that the mental abilities of large numbers of people tend to be lowest in the summer.Spring appears to be the best period of the year for thinking. One reason may be that in the spring man’s mental abilities are affected by the same factors that bring about great changes in all nature.Fall is the next-best season, then winter. As for summer, it seems to be a good time to take a long vacation from thinking! It seems that the cold winter()
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男性患者，53岁，发作性胸骨后疼痛2年，3h前出现胸骨后持续剧烈疼痛伴大汗来诊。查体：血压90/70mmHg，脉搏106/min，心音低，心律齐。尿比重1.024，中央静脉压3cmH2O，心电图Ⅱ、Ⅲ、aVF ST段抬高0.1～0.4mV。 入院后治疗过程中突然出现心尖区收缩期杂音，无震颤，心衰明显加重，最可能的原因是
教学的科学性是指教学内容要正确地反映客观世界及其运动规律，教给学生科学知识。( )
The wet volcanic ash that covered a Maya village in Central America in about AD 595 coated and preserved everyday objects beans, chilies, rope, gourds, even unwashed dishes -- just as they had been left, giving archaeologists a rare chance to learn about the everyday lives of the people of this pre-Columbian village. Exploration of the site, which is located in E1 Salvador and has been given the name Joya de Ceren, is now in its eighth season, and archaeologists are continuing to make new finds. The volcanic eruption that entombed Ceren more than 1,400 years ago began when lava pushed its way close enough to the surface to create a great explosion of steam and. ash that was centered just north of the village. The archaeologists have not found the remains of any human beings killed by the eruption in Ceren, suggesting that they had enough warning to flee. The eruption buried Ceren in a layer of ash 4 to 6 m (13 to 20 ft) deep over a period of a few days. One of the most striking of the conclusions drawn from the Ceren site is that the people of this ancient village lived more comfortably than average Salvadorans do today. Ceren’s architecture, crafts, and agriculture were surprisingly sophisticated and varied. They ate a rich variety of foods, had spacious, well-ventilated living and working quarters, and lavishly decorated many of their ceramic items. Yet Caren was an average farming village, not a seat of the ruling class or a regional center of commerce, archaeologists said. The village of Ceren was rediscovered in 1976 when a bulldozer operator knocked into the wall of one of the structures. Grasses that made up the thatched roof of the dwelling were still preserved, leading an archaeologist to conclude that the structure was recent. After two years, anthropologist Payson D. Sheets of the University of Colorado at Boulder discovered the antiquity of the structures when he dated a sample of thatch to about 1,400 years ago. Sheets was able to survey the site for only a few years before the civil war in El Salvador made it too dangerous to continue. The archaeologists left the site, located northwest of San Salvador, the capital, in 1980 and did not return until 1989. Since then, archaeologists led by Sheets have returned each year. As of spring 1997, they had digged 12 buildings, including a community hall, living quarters, kitchens, storerooms, a religious hall, a sauna, and even a small building believed to be the workplace of a shaman (a priest who uses magic). The smallest objects of daily life were preserved, sometimes as actual organic matter such as seeds or stems, sometimes as impressions in the ash such as that of a cornstalk or a squash. By sending radar signals through the ground in order to detect buried objects, archaeologists in I994 located 22 additional structures still buried in ash. Archaeologists at the site have found the remains of animals including dogs, deer, and a duck tied to a pole. All that remains of the people of Ceren, however, are their footprints, and a few teeth, believed to have been tossed on a roof for good luck. When the teeth were found, workers told Sheets that throwing teeth on the roof is a tradition still practiced by some people in rural El Salvador today. In the eyes of anthropologist Payson D. Sheets, ______.
If you see someone drowning, speed is very important. Once you get him out of the water, if he isn’t breathing, you have four minutes before his brain is completely damaged. Support his neck, tilt his chin upwards. This stops the tongue blocking the air way in the throat and is sometimes enough to get him breathing again. If that doesn’t work, start mouth-to-mouth breathing. Press his nostrils (鼻孔) together with your fingers. Open your mouth wide and take a deep breath. Blow into his lungs until his chest rises, and then remove your mouth and watch his chest fall. Repeat twelve times a minute, keep going until professional help arrives.To bring a child back to life, keep your lips around its mouth and nose and gently blow into its mouth. Give the first four breaths as quickly as possible to fill the blood with oxygen. If, in spite of your efforts, it starts turning blue grey colour, and you can feel no pulse, then pressing its chest is the last chance of saving its life.With arms straight, rock forward, pressing down on the lower half of the breastbones. Don’t be too hard, or you may break a rib (肋骨). Check how effectively you are by seeing if his colour improves or his pulse becomes independent to your chest pressing. If this happens, stop the pressing. Otherwise continue until an ambulance arrives. In doing mouth-to-mouth breathing, you have to ()
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