托福听力official7 Look at the four squares [[span class='strong-insert']][[/span]] that indicate where the following sentence could be added to the passage. Where would the sentence best fit?
答案解析
12.Look at the four squares [[span class='strong-insert']][[/span]] that indicate where the following sentence could be added to the passage. Where would the sentence best fit?
Thus, scientists had information about the shape of the domes but not about their chemical composition and origin.
C，四个过渡点，thus说明正确插入点之前的句子和待插入句子之间存在因果关系；名词shape，名词dome还有名词chemical composition and origin。dome和chemical composition and origin与原文的salt domes和crystalline salt重合，断定C或者D是正确答案；C点之前说这些dome已经用回声测过了，所以应该知道形状，thus表明的因果关系成立，所以C对D错。
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