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Where Has the Salt Come from?
Every now and then, we meet a fact about our earth that makes us feel strange and no answer for the fact has yet been found. Such a fact is the existence of salt in the oceans. How did it get there?
We simply do not know how the salt got into the ocean! We do know, of course, that salt is water-soluble, and so passes into the oceans with rainwater. The salt of the earth's surface is constantly being dissolved (溶解) and is passing into the ocean.
But we do not know whether this can explain the huge quantity of salt in oceans, if all the oceans were dried up, enough salt would be left to build a wall 180 miles high and a mile thick. Such a wall would reach once around the world at the Equator (赤道)!
The common salt that we all use is produced from seawater or the water of salt lakes, from salt springs (源泉) and from deposits of rock salt. The concentration (浓度) of salt in seawater ranges from about three per cent to three-and-one-half percent. The Dead Sea, which covers an area of about 340 square miles, contains about 11,600,000,000 tons of salt!
On the average, a gallon (加仑) of seawater contains about a quarter of a pound of salt. The beds of rock salt that are found in various parts of the world were all originally formed by the evaporation (蒸发) of seawater millions of years ago. It is believed that the thick rock-salt deposits were formed after about nine-tenth of the volume of seawater had been evaporated.
Most commercial salt is obtained from rock salt. The usual method is to drill wells (井) down to the salt beds. Pure "water is pumped down (抽进去) through a pipe. The water dissolves the salt and it is forced through another pipe up to the surface.
16 We have not fully understood how salt got into the ocean.
A Right B Wrong C Not mentioned
17 The author is sure that the dissolved salt from the earth's surface is the only source of the huge quantity of salt found in oceans.
A Right B Wrong C Not mentioned
18 If all the oceans were dried up, the salt thus obtained would be extremely great in size.
A Right B Wrong C Not mentioned
19 The percentage of salt content in the Red Sea is higher than that in the Dead Sea.
A Right B Wrong C Not mentioned
20 Beds of rock salt are found in every part of the world.
A Right B Wrong C Not mentioned
21 After evaporation, about ten percent of seawater becomes rock salt.
A Right B Wrong C Not mentioned
22 Most commercial salt is obtained from seawater.
A Right B Wrong C Not mentioned
环球网校友情提示：本文整理"2017年职称英语《卫生类B级》备考阅读判断题2"。如果您在此过程中遇到任何疑问，请登录环球网校职称英语频道及职称英语论坛，我们随时与广大考生朋友们一起交流!
【摘要】目前备考2017年职称英语考试的考生在循序渐进的模拟中。环球网校为考生整理了“2017年职称英语《卫生类B级》备考阅读判断题2”，希望备考2017年职称英语考试的考生都能顺利通关，更多资料敬请关注网校职称英语考试频道……
参考答案：1. A 2. B 3. A 4. C 5. A 6. A 7. B
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环球网校友情提示：本文整理"2017年职称英语《卫生类B级》备考阅读判断题2"。如果您在此过程中遇到任何疑问，请登录环球网校职称英语频道及职称英语论坛，我们随时与广大考生朋友们一起交流!