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单选题 It can be known from the passage that increase in the salinity of ocean water is caused by______

A． melting of sea ice
B． precipitation
C． evaporation
D． supplement of salt

【答案】C。解析：根据第一段“0ne ofthese is the subtraction of warer from the ocean bv means of evapora．tion．In this manner，the salinity is increased．”可知，答案为C，即海水蒸发可使盐度增加。

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1 Which of the following is not the cause of the decrease in the oceanic salinity? ______

A． Precipitation
B． Rain and snow
C． Formation of ice
D． Addition of water by rivers

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2 Which of the following statements is TRUE according to the passage? ______

A． Oceanic salinity has great effect on sea life
B． Many factors combine to cause changes in oceanic salinity
C． The movement of the water is related to the amount of salt
D． The temperature of the water has much to do with the oceanic salinity

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3 The purpose of mentioning the Weddell Sea is______

A． to give an example of cold-water salinity
B． to point out the location of deep waters
C． to make a comparison between hot-water salinity and cold-water salinity
D． to show that the water in the Weddell Sea varies in salinity from place to place

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