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Boreal forest is at the southern boundary of the moss-dominated tundra, which remains characteristically treeless because its spongy surface retains water that cannot drain away through the underlying permafrost. But as temperatures rise the permafrost recedes, (i)______ the (ii)______ of forest.
- Blank(i)
- impairing
- facilitating
- decelerating
- Blank(ii)
- renewal
- incursion
- decline
facilitating , incursion 显示答案
以上解析由 考满分老师提供。
