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  3. Animals perform many useful entertaining jobs. Dogs are particularly valuable in guiding the blind, protecting property, finding

Animals perform many useful entertaining jobs. Dogs are particularly valuable in guiding the blind, protecting property, finding

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问题     Animals perform many useful entertaining jobs. Dogs are particularly
valuable in guiding the blind, protecting property, finding losing              【M1】 ______
people, and hunting criminals. Horses are used in guarding herds, carrying
men in lands that there are no roads, and helping farmers work their            【M2】 ______
land. Pigeons have long used to carry messages. Wild animals from the           【M3】 ______
jungles, forests and seas are very popular performers in circuses and moving
pictures. People realized that, although animals may not have same              【M4】 ______
intelligence as human beings, they are enough smart to learn certain things.    【M5】 ______
    The first thing a dog taught is to obey. It should not take too long for    【M6】 ______
him to learn commands. Simple orders, such as "sit, lie down, stay there,
come here," can even be taught by a child.
    Training a dog to be a watchdog often produces unexpected results.
Soma dogs quickly learn the differences between unwanted people from            【M7】 ______
friends. This is because their masters welcome friends and invites them
into their house. However, some dogs will always attack the postman who
goes to deliver letters. One explanation for this behaviour is that,            【M8】 ______
the postman comes to the house often, he never enters the house. Therefore,     【M9】 ______
the dog thinks the postman is someone who is not wanted,
but keeps to come back anyway.                                                  【M10】 ______
【M3】
选项
答案used改成∧ been used
解析 pigeons与use的关系是被动。
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大学英语四级

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