单选题 {{B}}Passage 3{{/B}}

Most people have had a dog or wanted one as their companion at some time in their lives. If you are thinking of buying a dog, however, you should first decide what sort of companion you need and whether the dog is likely to be happy in the surroundings you can provide. Specialists' advice is useful to help you choose the most suitable kind of dog. But in part the decision depends on common sense. Different dogs were originally developed to perform specific tasks. So, if you want a dog to protect you or your house, for example, you should choose the one that has the right size and characteristics. You must also be ready to devote a great deal of time to training the dog when it is young and give it the exercise it needs throughout its life, unless you live in the countryside and can let it run freely. Dogs are demanding pets. Cats love the house and so are satisfactory with their place where there is secure, but a dog is loyal to its master and consequently wants him to show proof of his affection. The best time to buy a baby dog is when it is between 6 and 8 weeks old so that it can transfer its love for its mother to its master. If baby dogs have not established a relationship with the human being until they are over three months old, their strong relationship will always be with dogs. They are likely to be too shy when they are brought out into the world to become good pets.

单选题 Which of the following is NOT true according to the passage?

【正确答案】 B

【答案解析】[解析] 文章中提到了买狗的时候先要决定买什么样的，狗的大小、特征也要考虑，而且专家的建议也非常重要，所以A，C，D都是正确的。关于“common sense"，文章中是这样说的：“But in part the decision depends on common sense.”所以选择狗的时候，common sense并不是最重要的，而是部分因素。因此只有B不符合原文。

单选题 What is mentioned as a consideration in buying a dog?

【正确答案】 C

【答案解析】[解析] 根据文章的内容，买狗的时候并没有提到要考虑狗的颜色、狗的价格，以及狗能否和家中的其他宠物很好地相处。但是提到了要考虑狗能否适应周围的环境：“... whether the dog is likely to be happy in the surroundings you can provide.”因此C是正确答案。

单选题 Why does the writer day a dog is a more demanding pet than a cat?

【正确答案】 C

【答案解析】[解析] demanding：要求高的，费力的。作者认为狗是比猫费心的宠物，因为猫喜欢我们的房子，只要住的地方安全，它就会非常满足。而狗则不同，你必须在它很小的时候花很多的精力去训练它。如果你不住在农村，没有机会让狗自由活动的话，你还必须给它这样的机会。而且你最好买一只6至 8周大的小狗，这样有利于培养狗和主人的感情。可见养狗是多么费心。

单选题 Why is it advised to buy a baby dog under three months old?

【正确答案】 D

【答案解析】[解析] 文章的最后给出了答案：“If baby dogs have not established a relationship with the human being until they are over three months old，their strong relationship will always be with dogs.”所以要买三个月以下的狗，才容易和它建立感情。