2. 外语
  3. The relationship between human and dog dates back to at least 8,000 years ago. Different types of dogs were【S1】______for differe

The relationship between human and dog dates back to at least 8,000 years ago. Different types of dogs were【S1】______for differe

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问题     The relationship between human and dog dates back to at least 8,000 years ago. Different types of dogs were【S1】______for different tasks:the ancient people in west Asia, for example, trained greyhounds(灰狗)to【S2】______wild asses; in medieval manuscripts, illustrations of hunting scenes show terriers(猎犬)【S3】______rabbits.
    Recent research shows that dogs【S4】______another useful function: they keep us healthy. People who have any sort of pet are more likely to【S5】______heart attacks( blood pressure rises when we talk to one another whereas it drops when we pat a pet). Dog owners in particular show considerably【S6】______self-esteem and a 50% reduction in minor health problems only ten months after acquiring their pet.
    In the UK, thousands of people visit the annual dog show, "Crufts", held in London. This show receives wide national and international media【S7】______, Fierce discussions rage when dog liberty is threatened. There is no dog license in the UK because it was【S8】______several years ago. A recent law, the Dangerous Dogs Act, requires owners of especially vicious dogs, such as Pit Bull Terriers, to【S9】______their dogs with the authorities and muzzle(戴口罩)them when taking them outside. There was a great【S10】______from the public when this law was introduced.

A)abolished                      F)protest                       K)achieve
B)developed                      G)coverage                      L)pursuing
C)facilitated                    H)approved                      M)abandoned
D)register                       I)improved                      N)survive
E)reporting                      J)perform                       O)chase
【S4】
选项
答案J
解析 空格所在的从句缺少谓语动词，且应该为现在时态。句意：最近的研究表明，狗可以起到另外一种作用。perform有“履行，执行”的意思，符合句意。
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大学英语四级

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