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题目内容
Because howler monkeys rarely come out of the trees in their arboreal habitat, the continued well-being of the rain forest is _____ to their survival.
- Amarginal
- Btangential
- Cindispensable
- Dimperative
- Eexpeditious
- Fbaneful
C,D显示答案
以上解析由 考满分老师提供。