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Ragwort was accidentally introduced to New Zealand in the late nineteenth century and, like so many invading foreign species, quickly became a pest. By the 1920s, the weed was rampant. What made matters worse was that its proliferation coincided with sweeping changes in agriculture and a massive shift from sheep farming to dairying.
Ragwort contains a battery of toxic and resilient alkaloids: even honey made from its flowers contains the poison in dilute form. Livestock generally avoid grazing where ragwort is growing, but they will do so once it displaces grass and clover in their pasture. Though sheep can eat it for months before showing any signs of illness, if cattle eat it they sicken quickly, and fatality can even result.
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当前版本由 365585lgh 更新于2022-11-02 00:00:29 感谢由 365585lgh 对此题目的解答所做出的贡献。
A：文中只是说了有sweeping changes，但没说是decline；
B：无中生有；
C：increase toxic compound，比较关系的无中生有；
D：文中只是提到ragwort的花做的蜂蜜有毒，D中写阻止了人生产蜂蜜，过度了而且无关；
E：根据第一段的最后一句和第二段的最后一句推的，当时正由牧羊转变为牧牛（dairying 乳业），但是ragwort对牛的影响比羊大（牛吃了会死，羊不会）。
当前版本由 365585lgh 更新于2022-11-02 00:00:14 感谢由 365585lgh 对此题目的解答所做出的贡献。
A文中只是说了有sweeping changes，但没说是decline；
B无中生有；
C：increase toxic compound，比较关系的无中生有；
D：文中只是提到ragwort的花做的蜂蜜有毒，D中写阻止了人生产蜂蜜，过度了而且无关；
E：根据第一段的最后一句和第二段的最后一句推的，当时正由牧羊转变为牧牛（dairying 乳业），但是ragwort对牛的影响比羊大（牛吃了会死，羊不会）。
当前版本由 八狸 更新于2022-07-14 05:34:57 感谢由 八狸 对此题目的解答所做出的贡献。
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[数学 ]【新版】冲分救命题 -12222
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[数学 ]【新版】冲分救命题 -12211
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