Wolves generally avoid human settlements.For this reason, domestic sheep, though essentially easy prey for wolves, are not usually attacked by them.In Hylantia prior to 1910, farmers nevertheless lost considerable numbers of sheep to wolves each year.Attributing this to the large number for wolves, in 1910 the government began offering rewards to hunters for killing wolves.From 1910 to 1915, large numbers of wolves were killed.Yet wolf attacks on sheep increased significantly.
Which of the following, if true, most helps to explain the increase in wolf attacks on sheep?
A.Populations of deer and other wild animals that wolves typically prey on increased significantly in numbers from 1910 to 1915.
B.Prior to 1910, there were no legal restrictions in Hylantia on the hunting of wolves.
C.After 1910 hunters shot and wounded a substantial number of wolves, thereby greatly diminishing these wolves’ ability to prey on wild animals.
D.Domestic sheep are significantly less able than most wild animals to defend themselves against wolf attacks.
E.The systematic hunting of wolves encouraged by the program drove many wolves in Hylantia to migrate to remote mountain areas uninhabited by humans.
为什么D不对！答案选C 作者: sealg 时间: 2011-11-24 21:10
俺是菜鸟。。我觉得答案在CD里选，C如果狼原来以捕食domestic sheep
and 其他比较强壮的动物，因为能力削弱，只能捕羊。。。
俺觉得D应该加一个时间限制，也就是after 1910,因为如果prior to 1910和
after 1910是一样的，那还是可以同等比较，没有解释原因。。。
求拍。。。作者: tkcamfan 时间: 2011-11-25 20:49
D.Domestic sheep are significantly less able than most wild animals to defend themselves against wolf attacks. 事实上家养sheep本来就比野生动物自卫能力差，题目说了狼的数量减少，但攻击反而上升了，这里并没有给出解释这一个变化的原因。作者: shlshingse 时间: 2011-11-28 21:30
