原题
录音 1
According to the speaker, what happened to kelp forests when sea otters almost disappeared?
AThey became overgrown and crowded out other marine life.
BThey returned to their original size.
CThey were destroyed by expanding populations of sea urchins.
DThey began to attract species that the otters had previously preyed on.
正确答案：C
解题思路
老师暂未填写解题思路。