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  3. Human’s Hands Archaeological records--paintings, drawings, and carvings of humans engaged in activities involving the use of

Human’s Hands Archaeological records--paintings, drawings, and carvings of humans engaged in activities involving the use of

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问题                        Human’s Hands
   Archaeological records--paintings, drawings, and carvings of humans engaged in activities involving the use of hands--indicate that humans have been predominantly right - handed for more than 5,000 years. In ancient Egyptian artwork, for example, the fight-hand is depicted as the dominant one in about 90 per cent of the examples. Fracture or wear patterns on tools also indicate that a majority of ancient people were fight - handed.
   Cro-Magnon cave paintings some 27,000 years old commonly show outlines of human hands made by placing one hand against the cave wall and applying paint with the other. Children today make similar out lines of their hands with crayons on paper. With few exceptions, left hands of Cro-Manganese are displayed on cave walls, indicating thai the paintings were usually done by right-handers.
   Anthropological evidence pushes the record of handedness nearly human ancestors back to at least 1.4 million years ago. One important line of evidence comes from flaking patterns of stone cores used in tool making: implements flaked with a clockwise motion (indicating a right- handed toolmaker) can be distinguished frp, those flakea wan a counter- clockwise rotation (indicating a left -handed toolmaker).
   Even scratches found on fossil human teeth offer clues. Ancient humans 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-handers) are more common than scratches in the opposite direction (made by left-handers).
   Still other 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 modem Homo sapiens. Populations of Neanderthals, such as Homo erects and Ho mo habilis, seem to have been predominantly right -handed, as we are.
What is the main idea of the passage?
选项 A、Human ancestors became predominantly right- handed when they began to use tools.
B、It is difficult to interpret the significance of anthropological evidence concerning tool use,
C、Human and their ancestors have been predominantly right -handed for over a million years.
D、Human ancestors were more skilled at using both hands than modem humans.
答案C
解析 从第三段的Anthropological evidence pushes the record of handedness nearly human ancestors back to at least 1.4 million years ago．和后面以工具制造为证据这一方面可说明，人类主要是采用右手，人类使用右手已经有一百多万年的历史，所以答案为C。
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