Why are sled dogs said to be physical wonders? According to the race rules, dogs for race must have ______.

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问题 Why are sled dogs said to be physical wonders?
According to the race rules, dogs for race must have ______.

选项

答案proof of certain vaccines and check-ups

解析 由题干中the race rules可定位到第二个小标题下第五段首句For races such as the Iditarod,veterinarians are on hand to examine dogs,and race rules require proof of certain vaccines and check-ups.此处要求填入名词性短语作have的宾语。题干中have与原句require为同义,文中说,对于这类比赛,兽医会在现场对狗进行检查,比赛规则里也对——些疫苗和检查的保证作出要求,require后的部分proof of certain vaccines and check-ups符合题干语法和意思要求,为本题答案。
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