Our demand for water is constantly increasing. Every year there are more and more people in the world. Factories turn out more and more products and (23) A. need more and more water. We live in a world of water. But almost all of it – about 97%-is  in  the oceans. This water  is (24) C. too salty  to be used  for drinking,  farming, and manufacturing. Only about 3% of the world’s water is  fresh. Most of  this water is not easily available to man (25) B. because it is  locked in glaciers and icecaps. There  is as much water on earth today as there ever was or will ever be. Most of the water we use finds its way to the oceans. There, it is evaporated by the sun. It then falls back to the earth as rain.  Water is used and reused over again. It is never used up. Although the world as a whole has plenty of (26) D. fresh water, some regions have a water shortage. Rain does not fall evenly over the earth. Some regions are always too dry, and others  too wet. A.  region that usually gets enough  rain may suddenly have a serious (27) B. drought and another region may be flooded with too much rain.

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Đáp án:

`23, A.` need  

`24, C.` too

`25, B. `because

`26, D.` fresh  

`27, B. `drought