GRE Text Completion: JiJing 1373-GRE填空机经1373题 - VH5QMAH50E7EDT7DA

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. A. effect B. pressure C. eaten D. origin E. produce F. neutralized G. purpose H. suffer from I. poisoned