The first cells were probably ____.
A、aerobic
B、anaerobic and autotrophic
C、anaerobic and heterotrophic
D、auxotrophic
E、autotrophic
A、aerobic
B、anaerobic and autotrophic
C、anaerobic and heterotrophic
D、auxotrophic
E、autotrophic
第2题
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
A.a group of early hunters
B.the first men on earth
C.a great prehistoric thinker
D.the man who made the first cart
第4题
A.in ancient China.
B.in ancient Egypt.
C.in ancient Greece.
D.in ancient Rome.
第5题
A、Politicians
B、Biologists
C、Environmentalists
D、Oncologists
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