【正文】
e dog got ready to eat only when they heard this piece of music. They did not get ready to eat when they heard other piece of music. Then the scientists gave the dogs food every time they showed them a certain color. The dogs got ready to eat when they saw this color. The scientists then showed the dogs another color. Again the dogs got ready to eat. The colors were all the same to them. Colors are not all the same to the monkeys, however. For example, if we put food in a red box and do this every day, a monkey will always go to the red box to get the food. If we then put food in a blue box, the monkey won’t go to it. 11. All colors are the same to . A. all animals B. scientists C. monkeys D. dogs 12. Monkeys know that red and blue are . A. not the same B. the same C. colors D. food 13. The scientists give the dogs food every time they . A. saw the color red B. went to a box of food C. saw the color blue D. played certain music 14. Dogs are different from monkeys because . A. dogs can’t see any colors and monkeys can B. dogs can’t see more colors than monkeys C. monkeys can’t see any colors and dogs can D. monkeys can’t see red and blue 15. Some wanted to find out if dogs could see colors. A. animals B. doctors C. scientists D. monkeys Key: Ⅰ . 1. alone 2. full 3. difficulty 4. popular 5. moment 6. report 7. member 9. field 10. anize Ⅱ . 15 CBDAD 610 BCACC III. 15 CDBDA 610 ABBCB Ⅳ .1— 5 BABCC 610 FTFTF 1115 DADBC