lawyer_1 关于 weaken题型的问题

wildmantomba

Kate:  The recent decline in numbers of the Tennessee warbler, a North American songbird that migrates each fall to coffee plantations in South America, is due to the elimination of the dense tree cover that formerly was a feature of most South American coffee plantations.
近期TW（一种在秋天时从北美迁徙到南美的鸣禽）数量上的减少源自于密林（南美咖啡栽植地旧时特征）的消失

Scott:  The population of the spruce budworm, the warbler’s favorite prey in North America, has been dropping.  This is a more likely explanation of the warbler’s decline.
SB（鸣禽在北美最喜欢捕食的物种）数量上剧减，这更有可能是鸣禽减少的原因

探究鸣禽减少的原因，没谈到这个的都是无关选项

削弱Scott
他因导致：没有虫，鸣禽也减少
有因无果：虫少了，鸣禽没减少
有果无因：虫没少，鸣禽也减少

A）一种和TW一样以密林为生的鸣禽BO，不吃虫，数量也减少了  他因导致：没有虫，鸣禽也减少
B）SB的减少源自于一种不会影响到TW的疾病无关选项
C）SB的减少是暂时的无关选项
D）TW开始迁徙到其他地方无关选项
E）虽然北美鸣禽数量减少，其他物种也遭遇类型情况  无关选项