黃金閱讀 OG [Green Icebergs] - 英檢

對不起我又來請教大家了!!

Paragraph 2: 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.

3. Which of the sentences below best expresses the essential information in the
highlighted sentence in the passage? Incorrect choices change the meaning in
important ways or leave out essential information.
○One explanation notes that green icebergs stand out among other icebergs
under a great variety of light conditions, but this is attributed to an optical
illusion.
○One explanation for the color of green icebergs attributes their color to an
optical illusion that occurs when the light from a near-horizon red Sun
shines on a blue iceberg.
○One explanation for green icebergs attributes their color to a great variety
of light conditions, but green icebergs stand out best among other icebergs
when illuminated by a near-horizon red Sun.
○One explanation attributes the color of green icebergs to an optical illusion
under special light conditions, but green icebergs appear distinct from other
icebergs under a great variety of light conditions.

答案是D，但是我選了A

在想是我沒有把原句看懂，
因為根據我的理解，D選和A選的差別只是"BUT"前後調換
請大家幫忙解惑..


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