求牛人给解释。关于黄金阅读中mass extinction中第12题

rainandcmUID: 2442269

12.
What is the purpose of paragraph 7 in the passage?
○It proposes a decisive new test of the Alvarez hypothesis.
○It presents additional supporting evidence for the Alvarez hypothesis.
○It explains why evidence relating to the Alvarez hypothesis is hard to find.
○It shows how recent evidence has raised doubts about the Alvarez hypothesis
附上第七段：
Paragraph 7: An asteroid of this size would be expected to leave an immense crater, even if the asteroid itself was disintegrated by the impact. The intense heat of the impact would produce heat-shocked quartz in many types of rock. Also, large blocks thrown aside by the impact would form secondary craters surrounding the main crater. To date, several such secondary craters have been found along Mexico's Yucatan Peninsula, and heat-shocked quartz has been found both in Mexico and in Haiti. A location called Chicxulub, along the Yucatan coast, has been suggested as the primary impact site.
答案给的是C，可是真的不明白。
求解。万分感谢

rainandcmUID: 2442269

自己顶一下。寻大牛

hycqyUID: 2819662

2# rainandcm 你看的是什么的答案？ 我看的是B啊

rainandcmUID: 2442269

反正C我觉得肯定不对。就是黄金阅读里的答案啊。最新的黄金阅读6.3

hycqyUID: 2819662

4# rainandcm 恩 这是TPO15里的吧 我看的那个模考版的答案是B

rainandcmUID: 2442269

谢谢新一，呵呵

hycqyUID: 2819662

6# rainandcm 恩 不客气哈