Read the following passage and choose the best answer (A, B, C, D):
Water is of vital importance to all living things. Without it, all living things will  surely die. We also use a great (1)_____ of water daily in our homes, in factories, and in power stations. Most of this water is fresh water and it comes to us from reservoirs, rivers and lakes.  The Earth’s surface is (2)_____ by large areas of water which we call oceans and seas. If you have tasted the water from the sea, you will know that, unlike fresh water, seawater tastes salty. This is due to the (3)_____ of sodium chloride which comes from the land. Rivers carry it to the sea.  Although (4)_______salt nor fresh water has (5)________color, the sea often looks blue in the sunlight. The reason is that sunlight is made up of many colors. Some colors disappear quickly in the sea but blue light bounces back or is reflected, to the surface. This makes the sea look blue. Hence, a stormy sky will make the sea look grey

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