黃金閱讀41篇(OG)Green Icebergs - 英檢

A green iceberg that stranded just west of the Amery Ice Shelf
showed two distinct layers: bubbly blue-white ice and bubble-free green ice
separated by a one-meter-long ice layer containing sediments. The green ice
portion was textured by seawater erosion. Where cracks were present, the
color was light green because of light scattering; where no cracks were
present,the color was dark green. No air bubbles were present in the green ice,
suggesting that the ice was not formed from the compression of snow
but instead from the freezing of seawater. Large concentrations of
single-celled organisms with green pigments(coloring substances) occur
along the edges of the ice shelves in this region,and the seawater is rich in
their decomposing organic material.The green iceberg did not contain large
amounts of particles from these organisms, but the ice had accumulated
dissolved organic matter from the seawater.
It appears that unlike salt,dissolved organic substances are not excluded
from the ice in the freezing process. Analysis shows that the dissolved
organic material absorbs enough blue wavelengths from solar light to make the
ice appear green.

7. Why does the author mention that “The green ice portion was
textured by seawater
erosion”?
○ To explain why cracks in the iceberg appeared light green instead of dark
green
○ To suggest that green ice is more easily eroded by seawater than white ice
is
○ To support the idea that the green ice had been the bottom layer before
capsizing
○ To explain how the air bubbles had been removed from the green ice

請教戰友們 此題中C選要如何找到對應的選擇

想破頭還是不知道 海水侵蝕造成的綠色部分 跟3選 的關聯處

...我只能用刪去法把1,2,4都槓掉 冏

謝謝大家的回答 感謝!





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