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Evidences of Human History In the study of human history, there are many points that require study and research; there is one very important and interesting aspect to pay attention to, that is, the use of left or right hand in ancient humans’ activities. There has been some evidence which archaeologists have noticed and studied. What is more, many archaeological records—paintings, drawings, and carvings of humans engaged in activities involving the use of their hand—indicate that humans have been predominantly right-handed for more than 5000 years. These archaeological artworks are found almost all around the world, and though they were found to have been made in different times and places, there are many similar or identical features concerning hand use among them. In ancient Egyptian artworks, for example, the right hand is depicted as the dominant one in about 90 percent of the examples. What is more, in the archaeological artworks unearthed in Henan province, China has shown over 85 percent of the use of the right hand in manufacturing.(A) [■] Fracture or wear patterns on tools also indicate that a majority of ancient people were right-handed. In some experts’ theories, they also find that some patterns and styles can reveal the use of the right hand or the left hand. Cro-Magnon cave paintings of some 27000 years ago commonly show outlines of human hands made by placing one hand against the cave wall and applying paint with the other.(B) [■] With few exceptions, the left hands of Cro-Magnons are displayed on cave walls, indicating that the paintings were usually done by right-handers.(C) [■] This point can also be reflected in modern life. If you like, imagine the general gesture of painting or doing anything in your daily life, you will find the general features and styles of your actions, which can reflect your habit of hand use, and furthermore try to find a friend or someone else who uses the other hand and compare with his or her habits, the difference will be very clear and obvious. Besides the above archaeological artworks in the study of ancient human beings’ hand usage, there are also other kinds of evidence in this field, at first the anthropological evidence can push the record of handedness in early human ancestors back to at least 1.4 million years ago.(D) [■] Important evidence comes from the flaking patterns of stone cores used in tool making, and the implements flaked with a clockwise motion (indicating a right-handed toolmaker) can be found much more than those flaked with a counter-clockwise rotation (indicating a left-handed toolmaker). That means usually a right handed person chose the clockwise direction to make tools while a left handed man chose the counter-clockwise direction to make tools. Even scratches found on fossil human teeth offer clues. Ancient people are thought to have cut meat into strips by holding it between their teeth and slicing it with stone knives, as do the present-day Inuit. Occasionally the knives slip and leave scratches on the users’ teeth. Scratches made with a left-to-right stroke direction (by right-handed toolmaker) are more common than scratches in the opposite direction (by left-handed toolmaker). Still more evidence comes from cranial morphology: scientists think that physical differences between the right and left sides of the interior of the skull indicate subtle physical differences between the two sides of the brain. The variation between the hemispheres corresponds to which side of the body is used to perform specific activities. Such studies, as well as studies of tool use, indicate that right-or left-sided dominance is not exclusive to modern Homosapiens. Populations of Neanderthals, such as Homo Erectus and Homo Habilis, seem to have been predominantly right-handed, almost the same situation as ours today. According to Paragraph 4, the fact that the lnuit cut meat by holding it between their teeth is significant because ______.
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Civilization Before about 3500 BC, there were cultures, but not civilizations. Prehistoric men and women created societies, constructed houses, lived in villages, hunted and fished, farmed, made pottery, wove cloth and created languages. But unlike more advanced peoples, they did not build cities, read or write. Cities are the cornerstone of civilized life because with them came other civilizing elements, including differentiation of classes and employment, sophisticated religious and political systems, monumental architecture and the formation of states and empires. Historians usually begin the story of civilization with accounts of the world’s first great writers and city-builders, the Sumerians. Because the Sumerians recorded ideas and sagas and listed the names of their rulers, we know more about them than about prehistoric peoples who left their legacy in stones, bones and pottery. With the ability to build cities and record thoughts came the ability to communicate ideas and innovations over vast reaches of time and space. Human beings—who had formerly taken hundreds of thousands of years to learn that a stone ax sharpened on both sides is more useful than an ax sharpened on one side—progressed rapidly from foot travel to horse drawn carts, and later from railways to airplanes. With these and thousands of other innovations, people came to live longer, more comfortable lives. Civilization also brought new ills to humanity. In the 20th century it brought nuclear warfare, global warming, and ozone depletion. More subtly, civilization removed human beings from regular encounters with the wonders of the natural world. Unlike people of modern civilizations, primitive people lived close to the sounds and smells of forest and grasslands. They looked at fire and the stars with awe and reverence. Civilization involves the ability to create a new political and cultural world. In the 19th century the American writer, philosopher and naturalist Henry David Thoreau noted that this artificial sphere separates humanity from primitive virtue. "Most of the luxuries", he argued, "and many of the so-called comforts of life are not only not indispensable, but positive hindrances to the elevations of mankind." Thoreau believed that men and women should simplify their lives.(A) [■] To live well and happily usually doesn’t mean to live very luxuriously, the material enjoyment and much expense can satisfy you to some extent, but to enjoy a simple life also can make you feel fine and comfortable, something in your mind or in your spiritual world can bring more or influence much on your life and your happiness value.(B) [■] They expressed this sense of regret in the story of Prometheus and Pandora. Contrary to the wishes of other gods, Prometheus brought to humanity the gifts of fire, art and science. The jealous gods were unwilling to allow men and women to enjoy such blessings without cost, and so they sent Pandora to the world with a box containing disease, sorrow and other evils.(C) [■] From then on, the world wasn’t quiet or fortunate all the time, some people suffered from them and always got punished in one way or other. The people began to pay as well as they gain some achievement during the progress process. Human beings have viewed civilization as a mixed blessing. Civilized people have waged brutal wars, destroyed majestic forests and persecuted religious minorities.(D) [■] But civilizations have also achieved wonders. We cannot list with words all the achievements of the human beings with the help and development of civilization. The abilities of writing and reading can spread one kind of culture or invention to other places, and advanced science and technology have allowed human beings to enjoy much more convenient and interesting lives. With many inventions of modern life, many places where people could not reach before can be explored and developed by human beings and many new materials with very good properties can improve people’s lives and help do many jobs which were thought very difficult or impossible before. The word cornerstone in Paragraph 1 is closest in meaning to ______.
给晚期癌症病人镇痛时可选用的药物
患儿，女，5岁。因不明原因出血、发热入院，查体发现肝、脾、淋巴结肿大。 护士在护理患儿的过程中，能体现护士照顾角色的行为是
留取痰查癌细胞的标本时，应用乙醇固定，其浓度是
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