TPO15 MASS EXTINCTIONS - 英檢

※ 引述《Choriscol (粹雷戈)》之銘言：
: 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.
: 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
: 黃金閱讀的答案是C，但TPO內給的答案是B，我自己是選B
: 有請強者指教正確答案，謝謝 Orz


這題我也是選擇B- 對於Alvarez理論提供了額外的支持證據[*若沒說出其他的證據
則此選項措]


C選項的核心是-該段解釋了發現關於Alvarez理論的證據有多困難[*若沒有說明有
多困難則此選項錯]

思路:

1.作者在上一段最後的結語即說明: This iridium anomaly offers strong support
for the Alvarez hypotheis even though no asteroid itself has ever
been recovered.

作者的態度是:即使沒有直接的隕石被發現，那些iridum元素的異常對Alvarez理論
提供了強烈的支持---這邊就已經基本上否決掉C選項了，因為這邊已經算有證據了


2.好吧，即然沒辦法直接發現隕石(因為可能在撞擊中分解了)，如果真的
有那樣(大的)size的隕石撞擊了地球，除了上一段所說的有I元素的異常(證據1)外，
應該可以預期會留下很大的隕石坑吧!(證據2)，如果沒有證據2的話此段就變成是質疑
Alvarez理論(不過通常會先來個語氣詞之類的)，反之則是提供額外證據!!果其不然，
作者啪啦啪啦的說在XXX發現了primary impact site(文中還說了一個secondary
crater的不重要概念在此跳過)

因為上述思路，我選擇B選項，而非說明發現支持證據有多困難的選項C

PS 有些人看太快有可能把C選項想成 "發現(隕石)的證據有多困難"
恩，沒錯，該段就是在說明隕石都分解掉了，只有剩下隕石坑，選他!
其實題目問的是支持整個理論的證據唷^^~


煩請指教

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