2. 外语
  3. The skin of the poison dart frog contains deadly poison called batrachotoxins. But the (i)________ of the toxins has remained an

The skin of the poison dart frog contains deadly poison called batrachotoxins. But the (i)________ of the toxins has remained an

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问题 The skin of the poison dart frog contains deadly poison 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)  Blank (ii)    Blank (iii)
A. effect  D.pressure    G. eaten
B. origin  E. produce    H. neutralized
C. purpose F.suffer from I. poisoned
选项
答案B,E,G
解析 首句说青蛙皮肤包含剧毒物质。空格(i)和空格(ii)联动，说这种毒素的(i)________仍然是个谜，因为青蛙并不(ii)________它们。后面说如今发现了毒素的源头________melyrid beetle。现在发现了源头，证明在此之前大家并不知道这种毒素的源头在哪里。因此空格(i)要与此有关，B项origin(起源)符合。空格(ii)表示青蛙与毒素的关系，因为beetle是起源，所以青蛙并不产生毒素，空格(ii)表达“产生”的含义，E项produce(产生)最符合。再看空格(iii)，由于收集到的beetle标本都包含毒素，表明这些beetles是被青蛙________的。联系前面的内容，青蛙皮肤有毒，但毒素是beetle产生的，所以beetle是被青蛙吃了，G项eaten(吃掉)符合。
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