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托福阅读句子插入题：Green Iceberg

2015-08-18 16:21:35来源：网络

　　【托福阅读题型：Green Iceberg句子插入题】托福阅读中句子插入题是重要题型之一。根据托福阅读题型不同来进行专项练习，是短期提高托福阅读能力的有效方法。同学们需要多加练习哦!

　　查看全部：托福阅读题型分类练习之句子插入题

　　托福阅读句子插入题：Green Iceberg

　　【Paragraph 2】Icebergs are ordinarily blue to white, although they sometimes appear dark or opaque because　they carry gravel and bits of rock. They may change color with changing light conditions and cloud cover, glowing pinkor gold in the morning or evening light, but this color change is generally related to the low angle of the Sun above the　horizon. ■However, travelers to Antarctica have repeatedly reported seeing green icebergs in the Weddell Sea and,　more commonly, close to the Amery Ice Shelf in East Antarctica. ■One explanation for green icebergs attributes their　　color to an optical illusion when blue ice is illuminated by a near-horizon red Sun, but green icebergs stand out among　white and blue icebergs under a great variety of light conditions. ■Another suggestion is that the color might be related to　ice with high levels of metallic compounds, including copper and iron. ■Recent expeditions have taken ice samples from　green icebergs and ice cores—vertical, cylindrical ice samples reaching down to great depths—from the glacial ice　shelves along the Antarctic continent. Analyses of these cores and samples provide a different solution to the problem. (Green Icebergs)

　　Look at the four squares [■] that indicate where the following sentence could be added to the passage.

　　Scientists have differed as to whether icebergs appear green as a result of light conditions or because of something

　　in the ice itself.

　　Where would the sentence best fit?


　　答案见下一页：

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