Besides their wearability, either as jewelry or incorporated into articles of attire, beads possess the desirable characteristics of every collectible. They are durable, portable, available in infinite variety, and often valuable in their original cultural context as well as in today's market. Pleasing to look at and touch, beads come in shapes, colors, and materials that almost compel one to handle them and to sort them.
Beads are miniature bundles of secrets waiting to be revealed: their history, manufacture, cultural context, economic role, and ornamental use are all points of information one hopes to unravel. Even the most mundane beads may have traveled great distances and been exposed to many human experiences. The bead researcher must gather information from many diverse fields. In addition to having to be a generalist while specializing in what may seem to be a narrow field, the researcher is faced with the problem of primary materials that have little or no documentation. Many ancient beads that are of ethnographic interest have often been separated from their original cultural context.
The special attractions of beads contribute to the uniqueness of bead research. While often regarded as the "small change of civilizations", beads are a part of every culture, and they can often be used to date archaeological sites and to designate the degree of mercantile, technological, and cultural sophistication.
What is the main subject of the passage?
A.Materials used in making beads.
B.How beads are made.
C.The reasons for studying beads.
D.Different types of beads.
第3题
蛛网膜下腔出血叙述不正确的是
A、无局灶性神经体征
B、动静脉畸形是常见病因
C、血液直接流入蛛网膜下腔所致
D、脑底部动脉瘤或脑动静脉畸形破裂
E、突发剧烈头痛伴呕吐、颈项强直等脑膜刺激征
第4题
原发性蛛网膜下腔出血最常见的病因是()
A、脑动脉炎
B、高血压性动脉硬化
C、血液病
D、脑底囊性动脉瘤
E、脑血管畸形
第5题
蛛网膜下腔出血最常见的病因是
A.高血压脑动脉硬化
B.脑动脉炎性管壁坏死
C.动脉粥样硬化
D.动静脉畸形
E.先天性脑动脉瘤
第7题
蛛网膜下腔出血最常见的病因是
A、血液病
B、脑动脉炎
C、脑动静脉畸形
D、高血压性动脉硬化
E、先天性动脉瘤破裂
第8题
病变性质(诊断)最可能是
A.蛛网膜下腔出血
B.高血压性脑桥出血
C.脑栓塞
D.TIA
E.高血压脑病
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