更多"I believe that knowledge obtained f"的相关试题:
[填空题]I believe that knowledge obtained from actual experience is more valuable than ______.(书本中获得的更有价值)
[单项选择]Most geologists believe oil results from chemical transformations of hydrocarbons derived from organisms buried under ancient seas. Suppose, instead, that oil actually results from bacterial action on other complex hydrocarbons that are trapped within the Earth. As is well known, the volume of these hydrocarbons exceeds that of buried organisms. Therefore, our oil reserves would be greater than most geologists believe.
Which of the following, if true, gives the strongest support to the argument above about our oil reserves
A. Most geologists think optimistically about the Earth’s reserves of oil.
B. Most geologists have performed accurate chemical analyses on previously discovered oil reserves.
C. Ancient seas are buried within the Earth at many places where fossils are abundant.
D. The only bacteria yet found in oil reserves could have leaked down drill holes from surface contaminants.
E. (E) Chemical transformations reduce the volume of buried hydrocarbons derived from organisms by roughly the same proportion as bacterial action reduces the volume of other complex hydrocarbons.
[单项选择]
E
Many people believe the glare from snow causes snow blindnenss. Yet, dark glasses or not, they find themselves suffering from headaches and watering eyes, and even snowblindness, when ex- posed to several hours of "snow light".
The United States army has now determined that glare from snow does not cause snow blindness in troops in a snow-covered country. Rather, a man’ s eyes frequently find nothing to focus on in a broad expanse of barren snow-covered terrain. So his gaze continually shifts and jumps back and forth over the entire landscape in search of something to look at. Finding nothing, hour after hour, the eyes never stop searching and the eyeballs become sore and the eye muscles ache. Nature offsets this irritation by producing more and fluid which covers the eyeball. The fluid covers the eyeball in increasing quantity until vision blurs, then is observed, and the result is total, even though temporary,
A. concentrating to the solid white terrain
B. searching for something to look at in snow-covered terrain
C. providing the eyes with something to focus on
D. covering the eyeballs with fluid
[填空题]Many people believe the glare from snow causes snow blindness. However, the U.S. Army has now (36) that glare from snow does not cause snow-blindness in troops in a snow-covered country. Rather, a man’s eyes frequently find nothing to focus on in a broad (37) of barren snow-covered terrain. So his gaze continually (38) and jumps back and forth over the entire landscape in search of something to look at. Finding nothing, the eyes never stop searching and the eyeballs become (39) and the eye muscles ache. Nature (40) this irritation by producing more fluid which covers the eyeball. The fluid covers the eyeball in (41) quantity until vision blurs, then is (42) , and the result is snow blindness.
Experiments led the Army to a simple method of overcoming this problem. Scouts ahead of a main body of troops are trained to shake snow from evergreen bushes, creating a dotted line as they cross completely snow-cov
