更多"The scientific theories about the o"的相关试题:
[单项选择]
Many theories about the origin of the ocean have been proposed by scientists. The most widely accepted one is that the earth at some time in its very early history became hot enough to melt the materials from which it was formed. While in this molten state, lighter rock-forming materials (造岩材料) floated on the surface of the heavier ones. Then, between four and a half four billion (十亿) years ago, the molten earth cooled sufficiently to form a crust of rock that was many miles thick.
Surrounding the earth was an unbroken canopy of clouds miles thick and made up mostly of water vapor. Rain falling toward the still-hot earth was heated to steam and rose to the clouds again. After many millions of years, as the earth continued to cool, its surface temperature fell below the boiling point of water. Rainwater could now remain on the earth, covering its whole surface except for the higher places on earth that had been formed from the lighter rock materials.
In 1970, scien
A. the origin of the earth
B. the origin of the ocean
C. the history of the earth
D. the forming of the earth’s crust
[填空题]Among the theories to explain the origin of AIDS, the polio vaccine theory, in the opinion of the author of the article, seems to be the most plausible one.
[单项选择]Scientists have advanced many theories about why human beings cry tears , none of （） has been proved.
A. whom
B. which
C. what
D. that
[填空题]Most theories about the evolution of Earth have the same general point of view.
[单项选择]There are many theories about the beginning of drama in ancient Greece. The one most widely accepted today is based on the assumption that drama evolved from ritual. The argument for this view goes as follows. In the beginning, human beings viewed the natural forces of the world, even the seasonal changes, as unpredictable, and they sought through various means, to control these unknown and feared powers. Those measures which appeared to bring the desired results were then retained and repeated until they hardened into fixed rituals. Eventually stories arose which explained or veiled the mysteries of the rites. As time passed some rituals were abandoned, but the stories, later called myths, persisted and provided mate rial for art and drama.
Those who believed that drama evolved out of ritual also argue that those rites contained the seed of theater because music, dance, masks, and costumes were almost always used. Furthermore, a suitable site had to be provided for performances,
[填空题]Our theories about human disease are the product of current fashion 1. ______.
than we would like to admit. But just as the moment influences the hemline
and the automobile fender, so too a type of intellectual currency 2. ______.
affect our understanding of how illness happens. Much of
the 20th century is spent in pursuit of external causes of 3. ______.
disease - cigarettes, fatty foods, tick bites. Rather like the hero in an old western,
medicine’s work was to track down the bad guys, round them up 4. ______.
and squish them before a real commotion. Antibiotics, vaccines,
heart pills - these were our weapons in the epic battle betw
