题目

Number sense is not the ability to count. It is the ability to recognize a    14    in number. Human beings are born with this ability.  15  , 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   16  . However, if you remove two, the bird  17  leaves. This means that the bird knows the   18   between two and three. Another interesting experiment showed a bird's  19  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  20  until the man left the tower. The man had an  21  . He took another man with him to the tower. One man left and the other stayed, but they did not  22   the bird. The crow stayed away until the second man left, too. The experiment was   23  with three men and then with four men. But the crow did not return to the nest until all the men were  24  . It was not until five men went into the tower and only four left that they were  25  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   26   group. But when the number goes beyond three or four, the children are  27   fooled. It seems that number sense is something we have in common with many animals in this world, and that our human  28  is not much better than a crow's. 14. A. rise                          B. pattern                           C. change                   D. trend 15. A. Importantly         B. Surprisingly        C. Disappointedly       D. Fortunately 16. A. survive                     B. care                     C. hatch            D. notice 17. A. generally                 B. sincerely           C. casually           D. deliberately 18. A. distance            B. range                    C. difference           D. interval 19. A. amazing            B. annoying                  C. satisfying      D. disturbing 20. A. relax               B. recover              C. react             D. return 21. A. appointment         B. excuse              C. idea              D. explanation 22. A. fool               B. hurt                       C. catch            D. kill 23.A. reported                   B. repeated           C. designed      D. approved 24.A. confused            B. gone                     C. tired              D. drunk 25.A. gradually            B. luckily                C. strangely      D. finally 26.A. single               B. small                     C. local             D. new 27. A. seldom             B. temporarily            C. merely              D. often 28. A. sight               B. nature                    C. ability            D. belief 答案：CBDAC ADCAB BDBDC

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