原题
录音 1
How did elk behavior change after wolves were reintroduced to Yellowstone National Park?
AElk began to be more active at night.
BElk began to form larger groups.
CElk began to feed less near streams.
DElk began to hide among willow and aspen trees.
正确答案：C
解题思路
老师暂未填写解题思路。