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While the cerulean warbler's status may be particularly (i) _____, it is just one of the many species of migrant birds whose numbers have been (ii) _____for years. Increasingly, biologists investigating the causes of these (iii) ______are focusing on habitat loss in the Tropics,where the birds spend the winter.
- Blank(i)
- precarious
- secure
- representative
- Blank(ii)
- underreported
- falling
- copious
- Blank(iii)
- pairings
- migrations
- declines
precarious , falling , declines 显示答案
以上解析由 考满分老师提供。
