By saying "let nature take its course", the biologists mean______. The following are causes leading to the wolves’ decline in n

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问题 By saying "let nature take its course", the biologists mean______.
The following are causes leading to the wolves’ decline in number EXCEPT______.

选项 A、hunting
B、fights among packs
C、vehicles
D、Canine parvovirus

答案A

解析 事实细节题。对于引起狼数量减少的原因,文章分主次列出了一些,但重点分析丁微小病菌,最后三段提到狼群间的争斗和行驶车辆也是其数量减少的原因,四个选项中只有A"猎杀"是没有提到过的,故选A。
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