2. 外语
  3. Arctic sea ice comes in two varieties. Seasonal ice forms in winter and then melts in summer, while perennial ice persists year-

Arctic sea ice comes in two varieties. Seasonal ice forms in winter and then melts in summer, while perennial ice persists year-

admin2014-09-13  71
问题 Arctic sea ice comes in two varieties. Seasonal ice forms in winter and then melts in summer, while perennial ice persists year-round. To the untrained eye, all sea ice looks similar, but by licking it, one can estimate how long a particular piece has been float-
line ing around. When ice begins to form in seawater, it forces out salt, which has no place
5 in the crystal structure. As the ice gets thicker, the rejected salt collects in tiny pockets of brine too highly concentrated to freeze. A piece of first-year ice will taste salty. Eventually, if the ice survives, these pockets of brine drain out through fine, veinlike channels, and the ice becomes fresher; multiyear ice can even be melted and drunk.
Description
The passage describes two varieties of Arctic sea ice and explains how the freezing process causes seasonal ice to taste much saltier than perennial ice.
The passage mentions which of the following as being a characteristic of seasonal ice?
选项 A、It is similar in appearance to perennial ice.
B、It is typically filled with fine, veinlike channels.
C、It tastes saltier than perennial ice.
答案A，C
解析 Choices A and C are correct.
Choice A is correct: the passage states that "to the untrained eye, all sea ice looks similar"(lines 2-3).
Choice B is incorrect: it is clear that perennial ice contains fine, veinlike channels, but the passage does not mention whether seasonal ice contains them.
Choice C is correct: in lines 6-8, the passage establishes that first-year ice tastes salty but eventually gets fresher if the ice survives.
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