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  3. Animals perform many useful entertaining jobs. Dogs are particularlyvaluabl

Animals perform many useful entertaining jobs. Dogs are particularlyvaluabl

游客2023-07-28  65
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】 ______ [br] 【M9】
选项
答案 the postman改成although ∧ the postman
解析 在上一行“One explanation for this behaviour is that”中，that引导的表语从句里有两个完整的句子，因此要在其中的一个句子前加上连词，又因为两个句子是转承关系，所以在the postman前加上although。
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