Passage Three
According to the best historical and archaeological evidence, it is estimated that it took about 800 thousand to 1 million years for the earth's population to reach the 250 total which existed at the end of the first century 'after Christ. For some time after that, disease, famine, and war kept the population increase down to a fraction of 1 percent a year so that more than 15 centuries passed before the population reached 500 million. But in the next 250 years, up to 1850, the population of the world shot up to the 1 billion mark, and today it has reached 3 billion. It is predicted by United Nations investigators that in the next 35 years the population of the world will double. When experts are asked what the most effective measure which overpopulation poses, they reply that at least three measur A. estimates based on current population growth B. references in literature and mythology C. estimates based on previous population growth D. written records and cultural remains [单项选择]What is true according to the passage
A. She could see and hear again. B. She became a writer and wrote a lot of books. C. She painted many drawings. [单项选择]According to the passage, behavioral psychologists studying the extinction process have discerned which of the following
A. The exact length of time required for a fear response to become extinct in a human subject B. The effect of tone conditioning in comparison with other forms of stimuli C. The possible effects of surgical operations on the infralimbic cortice D. The potential of tone conditioning in treating undesirable fear responses E. The limits of Pavlov’s contribution to modern behavioral psychology [单项选择]According to the passage, rain prediction requires a quantitative description of droplet collision in turbulence for which of the following reasons
A. The "sling effect" remains unproven and requires experimental corroboration. B. The degree to which droplets collide is the only reliable method of assessing air flow. C. The degree of turbulence may help forecast the formation of large-size droplets that precipitate rain. D. Such factors as warm and cold fronts and individual cloud formations could not be performed otherwise. E. The laws which govern the formation of concentration heterogeneities still need to be discerned. 我来回答: 提交
|