21. Now many animals can do some simple jobs that are done by human beings.

22. The writer says that 8t a circus we can see animals doing cIever tricks. 23. The trainer usually gives the animal a piece of candy or fruit after it has done the trick. 24. The reward in the passage means "attention paid to a good behavior". 25. Many animals may be trained to do simple jobs if they know who their trainers are. 26. Geese can be used to guard a house. 27. When the pigeon sees a ball which looks different from the others , it makes a noise. 28. Trainer usually spends 40 days or so training a pigeon to inspect sm811 steel balls. 29. An ape is a large monkey. 30. Scientists believe apes may drive buses one day.

时间:2023-10-12 12:39:53

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