B. care

　　C. hatch

　　D. notice 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 has a nest in a tower, but the crow always left when she saw him coming.

　　4. A. generally

　　B. sincerely

　　C. casually

　　D. deliberately 5. A. distance

　　B. range

　　C. difference

　　D. interval 6. A. amazing

　　B. annoying

　　C. satisfying

　　D. disturbing 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 four men.

　　7. A. relax

　　B. recover

　　C. react

　　D. return 8. A. appointment

　　B. excuse

　　C. idea

　　D. explanation 9. A. fool B. hurt

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