2．Generally speaking，where has the higher salinity in the world?

　　A．The tropical regions.

　　B．The polar region.

　　C．The temperate zone.

　　D．The frigid zone.

　　答案　A　[细节理解题。由第三段第一句“Normally，in tropical regions where the sun is very strong，the ocean salinity is somewhat higher than it is in other parts of the world where there is not as much evaporation.”可知，通常热带地区的海水盐度较高，因为那里海水的蒸发量大。]

　　3．Which of the following statements is RIGHT?

　　A．The salinity of ocean waters is the same from place to place.

　　B．If the change of the salinity of ocean waters is small，it always doesn't matter.

　　C．Rain can lower the salinity of ocean waters.

　　D．When the sea ice is formed，the salinity of ocean waters is lower.

　　答案　C　[细节理解题。由第二段第一句“The opposite of evaporation is precipitation，such as rain，by which water is added to the ocean.”可知，雨水可以降低海水的盐度。]

　　4．Which of the following can be the best title for this passage?

　　A．Ocean Waters

　　B．The Changeable Ocean Waters

　　C．How to analyze the Salinity of Ocean Waters

　　D．The Salinity of Ocean Waters

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