2. 外语
  3. Man, even in the lower stages of development, possesses a faculty which, for want of a better name, I shall call number sense. T

Man, even in the lower stages of development, possesses a faculty which, for want of a better name, I shall call number sense. T

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问题     Man, even in the lower stages of development, possesses a faculty which, for want of a better name, I shall call number sense. This faculty permits him to recognize that something has changed in a small collection when, without his direct knowledge, and object has been removed from or added to the collection.
    Number sense should not be confused with counting, which is probably of a much later common trait and involves as we shall see, a rather intricate mental process. Counting, so far as we know, is an attribute exclusively human, whereas some brute species seem to possess an elementary number sense alike to our own at least, such is the opinion of competent observers of animal behavior, and the theory is supported by a weighty mass of evidence.
    Many birds, for instance, possess such a number sense. If a nest contains four eggs, one can safely be taken; but when two are removed, the bird generally deserts. In some unaccountably way the bird can distinguish two from three. But this faculty is by no means confined to birds. In fact, the most striking instance we know is that of the insect called the" solitary wasp". The mother wasp lays her eggs in individual cells and provides each egg with a number of live caterpillars(毛虫) per cell. But most remarkable is the case of the Genus Eumenus, a variety in which the male is much smaller than the female grub(蛆) and apportions(分配) the quantity of food accordingly: she does not change the species or size of the victims, but if the egg is male, she supplies it with five victims; if female, with ten. The regularity in the action of the wasp and the fact that this action is connected with a fundamental function in the life of the insect makes this last case less convincing than the one which follows. Here the action of the bird seems to border on the conscious.
    A landowner was determined to shoot a crow which made its nest in the water tower of his estate. Repeatedly he tried to surprise the bird, but in vain: at the approach of man the crow would leave its nest. One day the landowner hit upon a trick, two men entered the tower, one remained within, the other came out and went on. But the bird was not deceived: it kept away until the man within came out. The experiment was repeated on the succeeding days with two, three, then four men, yet without success. Finally, five men were sent: as before, all entered the tower, and one remained while the other four came out and went away. Here the crow lost count. Unable to distinguish between four or five, it promptly returned to its nest.
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答案number sense
解析 根据题干中关键词counting可定位到原文第二段首句前半部分Number sense should not be confused with counting(数字感觉与计数不同，二者不应混为一谈)。由此可判断，counting和number sense的概念并不相同。
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