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  3. Why are sled dogs said to be physical wonders? [br] According to the race rules,

Why are sled dogs said to be physical wonders? [br] According to the race rules,

游客2023-09-15  22
问题 Why are sled dogs said to be physical wonders? [br] 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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