【答案与解析】本文介绍timber wolfs所面临的危险处境，并分析了其原因和后果。
1.A。细节题。根据文章第4段第1句和第2句The timber wolf is on the endangered special list. Animals on this list are in danger of disappearing from the earth可推知此题答案为A。
2.B。细节题。根据文章第3段第1句because they eat sick and weak animals可推知此题答案为B。
3.A。细节题。根据文章第2段最后一句One kind was the North American timber wolf.
可推知此题答案为A。
