The end of the eighteenth century saw the emergence of prize-stock breeding, with individual bulls and cows receiving awards, fetching unprecedented prices, and excited enormous interest whenever they were put on show.
(A) excited
(B) it excited
(C) exciting
(D) would excite
(E) it had excited
答案C，但是没看懂这个句子的结构，主语是什么？the end of the eighteenth century??
谢谢各位！
19.In virtually all types of tissue in every animal species, dioxin induces the production of enzymes that are the organism’s trying to metabolize, or render harmless, the chemical that is irritating it.
(A) trying to metabolize, or render harmless, the chemical that is irritating it
(B) trying that it metabolize, or render harmless, the. chemical irritant
(C) attempt to try to metabolize, or render harmless, such a chemical irritant
(D) attempt to try and metabolize, or render harmless, the chemical irritating it（E）
(E) attempt to metabolize, or render harmless, the chemical irritant
答案E，同样，整个句子没看明白， 尤其是答案中the chemical irritant是做什么的？修饰什么？
谢谢ls！
"the century" saw！很奇怪的说法。。。
.
In virtually all types of tissue in every animal species, dioxin induces the production of enzymes that are the organism’s attempt to metabolize, or render harmless, the chemical irritant
答案E，同样，整个句子没看明白， 尤其是答案中the chemical irritant是做什么的？修饰什么？
句子结构：dioxin induces the production of enzymes..........,the chemical irritant.
chemical irritant 做dioxin的同位语。
哦！ 谢谢lissy_721~
刚看到白勇上有解释：the chemical that is irritating it 定语从句that is irritating 修饰the chemical，但是通常省略定语从句中的that 和be动词，使定语从句尽可能的简化，所以就成了the chemical irritant.
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