Which of the following best describes the func
问题详情
Which of the following best describes the function of the third paragraph of the passage?
A.It presents a specific example of the process discussed in the first two paragraphs.
B.It explains a problem that the researchers mentioned in the second paragraph has yet to solve.
C.It evaluates the research discoveries described in the previous paragraph.
D.It begins a detailed description of the process introduced in the previous two paragraphs.
参考答案
正确答案:D
解析:该题问:下面哪一个最好地描述了文章第三段所起的作用?D项意为“第三段开始详细描述前两段介绍的过程”。第三段提到:“某种蛋白的无酶催化糖基化过程,几十年来食品化学家早已了解,虽然生物学家直到最近才认识到同样的步骤也能发生在人体中。当葡萄糖醛基(CHO)和一个蛋白质的氨基(NH2)相互吸引时,无酶催化糖基化过程就开始。这些分子的结构在蛋白内部形成所谓的“席夫碱”(Schiff base)。这种结合并不稳定,很快重新组织成更为稳定,但仍然可逆转的物质,称之为阿马多利产品”。A项意为“这段提供了第一、二段内论述的过程的特定例子”;B项意为“这段解释了第二段内研究者提到问题得解决”;C项意为“这段评估了前一段描述的研究发现”。这三项都有欠缺。