编辑:
2014-04-13
Number sense is not the ability to count. It is the ability to recognize a __1__ in number. Human beings are born with this ability. __2__ ,experiments show that many animals are, too. For example, many birds have good number sense. If a nest has four eggs and you remove one, the bird will not __3__. However, if you remove two, the bird __4__ leaves. This means that the bird knows the __5__ between two and three.
Another interesting experiment showed a bird's __6__ number sense. A man was trying to take a photo of a crow(乌鸦) that had a nest in a tower, but the crow always left when she saw him coming. The bird did not __7__ until the man left the tower. The man had an __8__. He took another man with him to the tower. One man left and the other stayed, but they did not __9__ the bird. The crow stayed away until the second man left, too. The experiment was __10__ with three men and then with four men. But the crow did not return to the nest until all the men were __11__. It was not until five men went into the tower and only four left that they were __12__ able to fool the crow.
How good is a human's number sense? It's not very good. For example, babies about fourteen months old almost always notice if something is taken away from a __13__ group. But when the number goes beyond three or four, the children are __14__ fooled.
It seems that number sense is something we have in common with many animals in this world, and that our human __15__ is not much better than a crow's.
1. A. rise B. pattern C. change D. trend
2. A. Importantly B. Surprisingly C. Disappointedly D. Fortunately
3. A. survive B. care C. hatch D. notice
4. A. generally B. sincerely C. casually D. deliberately
5. A. distance B. range C. different D. interval
6. A. amazing B. annoying C. satisfying D. disturbing
7. A. relax B. recover C. react D. return
8. A. appointment B. excuse C. idea D. explanation
9. A. fool B. hurt C. catch D. kill
10. A. repo B. repeated C. designed D. approved
11. A. confused B. gone C. tired D. drunk
12. A. gradually B. luckily C. strangely D. finally
13. A. single B. small C. local D. new
14. A. seldom B. temporarily C. merely D. often
15. A. sight B. nature C. ability D. belief
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