对骨瘤描述不正确的是（）。
A.由骨膜性成骨过程异常，以致密骨小梁结构过度增殖所形成的一种少见的良性肿瘤
B.最常见的发生部位是颅骨和下颌骨表面
C.发病年龄15～18岁不等，以40～50岁常见，男女发病率相当
D.发病率占骨肿瘤总数5%，占良性骨肿瘤的9%
E.骨瘤伴随人体的生长发育而生长，发育成熟后大部分骨瘤也停止生长。生长于颅骨表面的骨瘤大多是由于可见的皮内骨性突起而求医确诊，一部分是由于生长部位特殊引起刺激、压迫、阻塞而引起相应症状而就诊
参考答案：C
| Every summer, Jean Piaget retreats to his cabin in the Alps, where he spends most of his days analyzing the mass of research data generated over the past year at his Center for Genetic Epistemology. During long walks along the mountain trails, he mulls over the latest experimental results, and in the cool mountain evenings, he formulates his conclusions. With the approach of fall, he will descend from the mountain, manuscript for a book and several journal articles in hand. This time-honored procedure of careful observation followed by seclusion for thought and synthesis, has enabled him to become the most prolific, if not the most famous psychologist of the century. Piaget has only been widely known in this country since the 1960s, when his works were translated from their original French. But he has been recognized as an expert in the field of cognitive development in Europe since the 1930s. In fact, Piaget’s publishing career can be traced to the year 1906, when as a child of ten, he published his careful notes on the habits of an albino sparrow he observed near his home in Switzerland. After his precocious debut as an ornithologist, he took an after school job at the local natural history museum, soon becoming an expert on mollusks. At the age of sixteen he was recommended for a curator’s position at the natural history museum in Geneva, but declined in favor of continuing his education. He studied natural science at the University of Neuchatel, obtaining his doctorate at the age of twenty-one. His readings in philosophy stimulated an intense interest in epistemology-the study of humans acquire knowledge. Convinced that cognitive development had a genetic basis. Piaget decided that the best way to approach epistemology would be through its behavioral and biological components. Psychology appeared to be the discipline that best incorporated this approach. |
According to the passage, Piaget went to the mountains every summer to
A．collect data for his research.
B．avoid the city heat and enjoy the cool weather.
C．live in his cabin where he could analyze the data he collected there.
D．analyze his research data he had collected before.
