更多"Leonardo da Vinci was the first man"的相关试题:
[填空题]Leonardo da Vinci was the first man to suggest that growing trees add a ring in their trunks each year. The (47) is these rings relates to the physical conditions which the tree experiences. Thus, trees grown in a (48) area and time each develop a pattern or configuration of their rings.
This (49) was of little significance until Andrew E. Douglas began to study tree rings in Arizona in 1600. Using a technique called cross dating, he was able to employ tree rings to the study of archaeological sites and date the ruins with (50) . Some were as old as 6700 B.C. ! This study of tree rings is called dendrochronology(树木年代学).
In time the cross dating was (51) by a carbon 14 process. This approach measured the amount of carbon 14 radiating from a piece of wood and (52) determined the age of that wood. Further use of the carbon 14 technique has shown that the radiation process is more complex and less (53)
[填空题]Da Vinci was the first robotic system to be applied and approved by the Food and Drug Administration.
[填空题]Freud was the first man to help mental patients by having them talk about what made them anxious.
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The first man who cooked his food, instead of eating it raw, lived so long ago that we have no idea who he was or where he lived. We do know, however, that (1) thousands of years, food was always eaten cold and (2) . Perhaps the first cooked food was heated accidentally by a (3) fire or by the molten lava form an erupting (4) . No doubt, when people first tasted food that had been cooked, they found it tasted better. However, (5) after this discovery, cooked food must have remained a rarity (6) man learned how to make and control fire (7) .
Primitive men who lived in hot regions could depend on the heat of the sun (8) their food. For example, in the desert (9) of the southwestern United States, the Indians cooked their food by (10) it on a flat (11) in the hot sun. They cooked pieces of meat and thin cakes of corn meal in this (12) . We can surmise that the earliest kit
A. supported
B. replaced
C. changed
D. switched
