文勇的新托福黄金&ccedil

beensuggestedthatiftheenvironmentwerecapableofsupport

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Unformatted text preview: ea 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 near­horizon 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. 301 [email protected] 在在在在在在 www.liuwenyong.com 在在在在在在在在在在在在在在在,在在在在在在在在在在 13. Look atthe 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? 14. Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points. Several suggestions, ranging from light conditions to the presence of metallic compounds, have been offered to explain why some icebergs appear green. ● ● ● Answer Choices ○Ice cores were used to determine that green icebergs were formed from the compaction of metallic compounds, including copper and iron. ○All ice shelves can produce green icebergs, but the Amery Ice Shelf is especially well suited to do so. ○Green icebergs form when a two layer block of ice breaks away from a glacier and capsizes, exposing the bottom sea ice to view. ○Ice cores and samples revealed that both ice shelves and green icebergs contain a layer of bubbly glacial ice and a layer of bubble­free sea ice. ○Green icebergs are white until they come into contact with seawater containing platelets and soluble organic green pigments. ○In a green iceberg, the sea ice contains large concentrations of organic matter from the seawater. 302 [email protected] 在在在在在在 www.liuwenyong.com 在在在在在在在在在在在在在在在,在在在在在在在在在在 在在在在在 1. ○3 2. ○2 3. ○4 4. ○2 5. ○1 6. ○4 7. ○3 8. ○1 9. ○1 10. ○4 11. ○2 12. ○3 13. ○2 14. ○3, 4, 6 303 [email protected] 在在在在在在 www.liuwenyong.com 在在在在在在在在在在在在在在在,在在在在在在在在在在 在在在在 在在在在 在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在在 12%在在在在在在在----在在在在在, 在在在, 在在在在在在在在在在在在在在在在在在在在在 ----在在在在在在在在在在在...
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This note was uploaded on 09/17/2013 for the course LANGUAGE 13DL208 taught by Professor Wang during the Fall '13 term at East China Normal University.

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