大海的含盐率是多少(海水里有太多的盐的英文)

一位伟人曾说，反复操练是非常必要的，你越多的将所学到的东西运用到实际生活中，他们就变的越自然。学习六级阅读理解也是一样的，要适当的掌握英语六级阅读技巧，才能在英语六级阅读理解中取得好成绩。今天四六级为大家分享2019年6月英语六级阅读理解：大海中的含盐量，希望对您有所帮助。

英语六级阅读理解：大海中的含盐量

If the salinity(含盐量) of ocean waters is analyzed, it is found to vary only slightly from place to place.Nevertheless, some of these small changes are important. There are three basic processes that cause a change in oceanic salinity. One of these is the subtraction of water from the ocean by means of evaporation--conversion of liquid water to water vapor. In this manner, the salinity is increased, since the salts staybehind. If this is carried to the extreme, of course, white crystals of salt would be left behind.

The opposite of evaporation is precipitation(降水), such as rain, by which water is added to the ocean. Here the ocean is being diluted(稀释) so that the salinity is decreased. This may occur in areas of high rainfall or in coastal regions where rivers flow into the ocean. Thus salinity may be increased by the subtraction of water by evaporation, or decreased by the addition of fresh water by precipitation or runoff(形成地表水部分的降水).

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. Similarly, in coastal regions whererivers dilute the sea, salinity is somewhat lower than in other oceanic areas.

A third process by which salinity may be altered is associated with the formation and melting of sea ice. When seawater is frozen, the dissolved materials are left behind. In this manner, seawater 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, off Antarctica, the densest water in the oceans is formed as a result of this freezingprocess, which increases the salinity of cold water. This heavy water sinks and is found in the deeper portions of the oceans of the world.

六级阅读理解练习题：

Choose correct answers to the question:

1.The best title of the passage can be “_____”.

A.Typical Oceans and Their Respective Features

B.The Causes of the Changes in Salinity of Ocean Water

C.Different Oceans Have Different Salinity

D.The Precipitation and Evaporation of Oceans

2.Which of the following processes will increase salinity of ocean waters?

A.Evaporation.

B. Precipitation.

C. Melting.

D. Dilution.

3.According to this passage, the sea _ is likely to have the lowest salinity.

A. in tropical areas

B. off Antarctica

C. of high rainfall

D. with abundant

4.The Weddell Sea _____.

A.is a good example of increased salinity in freezing sea water

B.is much larger in area than the Arctic oceans

C.has a much lower salinity now than ever

D.has the denser water in its upper parts

5.Coastal regions are mentioned as cases where _____.

A.sea water is less salty because fresh water joins in

B.rivers carry industrial exhaust into sea

C.sea ice tends to melt more quickly than in the center of oceans

D. heavy water sinks to the deeper portions of the oceans

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