A third process by which salinity may be altered is associated with the formation and melting of sea ice.When sea water is frozen,the dissolved materials are left behind.In this manner,sea water directly beneath freshly formed sea ice has a higher salinity than it did before the ice appeared.Of course,when this ice melts,it will tend to decrease the salinity of the surrounding water.
In the Weddell Sea Antarctica,the densest water in the oceans is formed as a result of this freezing process,which increases the salinity of cold water.This heavy water sinks and is found in the deeper portions of the oceans of the world.
Notes:
salinity n.盐度 ②conversion n.转化 ③dilute vt.淡化
【语篇解读】 本文是说明文。全文首先说明了为什么海水的含盐量很高,接着又说明了世界各地海水的含盐量是不一样的,例如降雨量小的地方含盐量高,而降雨量大的地方含盐量低。海水的含盐量也与海水的蒸发量以及结冰程度有关。
1. What does the underlined word in the first paragraph mean?
A.Escape.
B.Decrease.
C.Pollution.
D.Increase.
答案 B [猜测词义题。由画线词语所在句子可知,“evaluation”与画线词语的意义相关,蒸发后海水量一定会“减少”。]
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