Why are sled dogs said to be physical wonders? [br] Nowadays sled dogs are still

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问题 Why are sled dogs said to be physical wonders? [br] Nowadays sled dogs are still necessary when ______.

选项 A、there are severe weather conditions
B、flying machines are full with passengers
C、snow machines use up power in the Arctic region
D、people need partners during the travel

答案 A

解析由题干中necessary可定位到第一个小标题下第六段第一句there are still times when dog transportation is preferred和第二句Harsh weather conditions can make flying hazardous, and certain terrain can be more difficult for snow machines to cross than for dogs．题干问如今在何种情况下，仍需要sled dogs。根据原文上下文童思，第三句作厂具体说明，该句中harsh weather conditions与A中severe weather conditions意思一致，故选A。

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