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Question of the day
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Question of the Day (31-Oct-19)

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The question below contains a paragraph with a missing sentence. Choose an option that best fits the context.

There are vast amounts of water on earth. Unfortunately, over 97% of it is too salty for human consumption and only a fraction of the remainder is easily accessible in rivers, lakes or groundwater. Climate change, droughts, growing population and increasing industrial demand are straining the available supplies of fresh water. More than 1 billion people live in areas where water is scarce, according to the United Nations, and that number could increase to 1.8 billion by 2025. _________________. Its appeal is obvious. The world’s oceans, in particular, present a virtually limitless and drought-proof supply of water.
OPTIONS
 
 1)However, there are now 13,080 desalination plants in operation around the world, producing expensive but desalinated potable water.
 2)But desalination requires large amounts of energy and can cost several times as much as treating river or groundwater.
 3)One time-tested but expensive way to produce drinking water is desalination: removing dissolved salts from sea and brackish water.
 4)As more parts of the world face prolonged droughts or water shortages, desalination seems to be the only way out.
 5)However, apart from being expensive, a large desalination plant can suck up enough electricity in one year to power more than 30,000 homes.

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