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| 作者：不明 来源：www.pccode.net 整理 发布时间：2007-1-23 10:37:10 发布人：wongrs | |
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who now cared for the young animal during a period of infancy in which vaguer instincts than those of the insects were molded to suit surroundings which might be considerably changed without harm. This means, one might at first imagine, that gradually heredity becomes less and environment more important. But this is hardly the truth and certainly not the whole truth. For although fixed automatic responses like those of the insect-like creatures are no longer inherited, although selection for purification of that sort is no longer going on, yet selection for educability is very definitely still of importance. The ability to acquire habits can be conceivably inherited just as much as can definite re responses to narrow situations. Besides, since a mechanism---is now, for the first time, created by which the individual (in contradiction to the species) can be fitted to the environment, the latter becomes, in another sense, less not more important. And finally, less not the higher animals who possess the power of changing their environment by engineering feats and the like, a power possessed to some extent even by the beaver (海狸),and preeminently(卓越地)by man. Environment and heredity are in no case exclusive but5 always-supplementary factors. 55. Which of the following is the most suitable title for the passage? A. The Evolution of Insects B. Environment and Heredity C. Education: The Influence of the Environment D. The Instincts of Animals 56. What can be inferred from the example of the ant-lion in the first paragraph? A. Instincts of animals can lead to unreasonable reactions in strange situations. B. When it is engaged in a chain actions it cannot be interrupted. C. Environment and heredity are two supplementary factors in the evolution of insects. D. Along the lines of evolution heredity becomes less and environment more important. 57. Based on the example provided in the passage, we can tell that when a spider is removed to a new position where half of a net has been made, it will probably. A. begin a completely new net B. destroy the half-net C. spin the test of the net D. stay away from the net 58. Which of the following is true about habits according to the passage? A. They are natural endowments to living creatures B. They are more important than instincts to all animals C. They are subject to the formative influence of the environment. D. They are destined to open out a much more fa
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