The first paragraph is written to ______. In the text, a comparison is made so as to ______.

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问题 The first paragraph is written to ______.
In the text, a comparison is made so as to ______.

选项 A、abolish the slave trade
B、elaborate a higher purpose of animal research
C、warn that mankind has a duty not to cause pain to animals
D、assert that science is, by and large, kind to its animals

答案B

解析 本题是一道细节题,测试识别理解原文中常见语言基本结构的能力。本题的答案信息来源在第四段的尾句,该句中的"just as"(正如…一样)所表达的恰恰是一种"比较"(comparison)。第四段尾句的作用是对第四段倒数第二句进行进一步的具体解释和说明。因此,第四段尾句中含有的比较结构是来具体说明解释"动物研究的目的是一个更高的目的"(Animal research is for a higher purpose)。故本题的正确选项是"elaborate a higher purpose of animal research"(阐述动物研究的更高目的)。
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