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

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