材料：The Official SAT Study Guide
试卷：4
页数：689
题号：48
Questions 42-52 are based on the following passage and supplementary material.This passage is adapted from Carolyn Gramling, “Source of Mysterious Medieval Eruption Identified.” ©2013 by American Association for the Advancement of Science.
It’s not a total surprise that an Indonesian volcano might be the source of the eruption, Miller says. “An equatorial eruption is more consistent with the apparent climate impacts.” And, he adds, with sulfate appearing in both polar ice caps—Arctic and Antarctic—there is “a strong consensus” that this also supports an equatorial source. Another possible candidate—both in terms of timing and geographical location—is Ecuador’s Quilotoa, estimated to have last erupted between 1147 and 1320 C.E. But when Lavigne’s team examined shards of volcanic glass from this volcano, they found that they didn’t match the chemical composition of the glass found in polar ice cores, whereas the Samalas glass is a much closer match.That, they suggest, further strengthens the case that Samalas was responsible for the medieval “year without summer” in 1258 C.E.
48. As used in line 68, the phrase “Another possible candidate” implies that
A) powerful volcanic eruptions occur frequently.
B) the effects of volcanic eruptions can last for centuries.
C) scientists know of other volcanoes that erupted during the Middle Ages.
D) other volcanoes have calderas that are very large.
答案: C
答案解析:这道题问的是 “Another possible candidate” 暗示了什么。我们定位到Line 68发现这个短语在这段开头，因此我们需要结合上一段的内容来进行判断。上一段(Lines 61-67)主要讲的是 “Indonesian volcano” 也可能是爆发的来源。那么，下一段(Line 68)开头提到 “Another possible candidate…is Ecuador’s Quilotoa, estimated to have last erupted between 1147 and 1320 C.E.” 从 “another” 可以看出，这两段是并列关系，也就是说后面一段提到的 “Ecuador’s Quilotoa” 也可能是爆发的来源。
A选项说暗示了威力强大的火山爆发经常发生。仅一个 “another” 不足以说明 “occur frequently”，同时这也不能支撑文章主题强调的 “Source”，因此排除。
B选项说暗示了火山爆发的影响能持续几个世纪。 但是 “Another possible candidate” 并不能体现关于时间的任何暗示，因此排除。
C选项说暗示了科学家知道还有其它火山在中世纪时期爆发。正如我们之前分析的，“Another possible candidate” 是指 “Ecuador’s Quilotoa” 也可能是爆发的来源，也就是说，科学家知道“Ecuador’s Quilotoa” 也是在中世纪爆发的，该选项可以成立。
D选项说暗示了其它火山的破火山口很大。从 “Another possible candidate” 无法推出该信息，排除。
重点词汇：
volcano: [vɒl'keɪnəʊ] n. 火山 (复数 volcanoes或volcanos)
eruption: [ɪ'rʌpʃ(ə)n] n. 爆发，喷发;火山灰
equatorial: [,ekwə'tɔːrɪəl] adj. 赤道的，近赤道的;中纬线的
candidate: ['kændɪdeɪt] n. 候选人，候补者;应试者