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The skin of the poison dart frog contains deadly poisons called batrachotoxins. But the (i)_____ of the toxins has remained an enigma, as the frog does not (ii)_____ them. Now an analysis suggests that the melyrid beetle is the source. Collected beetle specimens all contained batrachotoxins, suggesting that these beetles are (iii)_____ by the frogs.
- Blank(i)
- effect
- origin
- purpose
- Blank(ii)
- pressure
- produce
- suffer from
- Blank(iii)
- eaten
- neutralized
- poisoned
origin , produce , eaten 显示答案
以上解析由 考满分老师提供。
