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  3. By saying "let nature take its course", the biologists mean______. Canine parvovirus is a disease which______.

By saying "let nature take its course", the biologists mean______. Canine parvovirus is a disease which______.

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问题 By saying "let nature take its course", the biologists mean______.
Canine parvovirus is a disease which______.
选项 A、the pups are immune from
B、only spreads among domestic dogs
C、is hardy enough to keep alive for months in the soil
D、only hits wolves on the northern range
答案C
解析 事实细节题。这个题目是关于犬类疾病的，选项A"幼犬对该疾病有免疫力"，根据第二段"That pups have suffered the decline seems to suggest the culprit is parvo, said Ed Bangs，"Nursing pups receive immunity from their mother’s milk, but the immunity drops when nursing stops."可知，正是由于幼犬没有免疫力才感染这种疾病，造成数量下降的；B"只在家养犬中传播"，根据第四段"the disease spread rapidly to domestic dogs and then into wild animal populations"(除了在家犬中传播外，这种疾病还会蔓延到野生动物中去)可判断这与文章内容不符；C"这种疾病非常顽强，可以在土壤中存活几个月"，根据第四段"Because parvo it so hardy, "persists in the soil for months."一句可知这是正确论述；D"只对北方区域的犬造成影响"，而第四段说的是"The disease has hit wolves on the northern range… especially hard."指这种疾病在北方区域的犬中尤为厉害，而并不是只会影响北方区域的犬。
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