题目解析:
【题目翻译】为什么文章要提到:太平洋环礁上的钻孔在到达海底岩石底层之前穿过一千多米的珊瑚?
A:强调根据达尔文的观点,珊瑚可以在很深的地方生长。
B:表明科学家们如何知道地壳沉降的速度。
C:为了支持珊瑚礁的形成需要数百万年的说法。
D:提出证实达尔文关于珊瑚礁进化的说法的证据。
【判定题型】:根据题干问法“why …… provide”,题目询问“xxxxxx”(文章引用内容)的修辞目的,可以判断本题为修辞目的题。
【关键词定位】:根据关键词“The drill holes”,定位到Passage 3最后两句话,原句为“The drill holes passed through more than a thousand meters of coral before reaching the rock substratum of the ocean floor, and indicated that the coral had been growing upward for tens of millions of years as Earth's crust subsided at a rate of between 15 and 51 meters per million years. @@@@Darwin s theory was therefore proved basically correct. @@@@There are some submarine islands called guyots and seamounts, in which subsidence associated with sea-floor spreading has been too speedy for coral growth to keep up.
”。
【引用内容分析】原文Darwin s theory was therefore proved basically correct,说明举例太平洋环礁就是为了证明达尔文理论正确。
【选项分析】
A:强调根据达尔文的观点,珊瑚可以在很深的地方生长。未提及,错误。
B:表明科学家们如何知道地壳沉降的速度。未提及,错误。
C:为了支持珊瑚礁的形成需要数百万年的说法。未提及,错误。
D:提出证实达尔文关于珊瑚礁进化的说法的证据。与原文相符,正确