For questions 1-8, read the text below and decide which answer (А, В, C or D) best fits each gap. There is an example at the beginning (0).
Example:
| A away | В out | C off | D down |
Sea Water
What do we know about sea water? For one, 97% of all water on Earth is saline. A popular question is whether it is drinkable. It is, but it will not make your thirst go 0 _____. That is largely due to the fluid your body will need to get rid of 1 salt that finds its way into your system.
If you ask a person about the 2 for why sea water is salty, you might get many different responses. The salinity comes from rainwater washing down salt deposits from rocky surfaces on 3 . Another 4 factor is chloride eruptions from the floor of the sea.
Sea water possesses some rather interesting 5 . For one, it does not freeze as easily because salt lowers the freezing point. However, when it does freeze at a temperature of around -21° C, the ice can be thawed back to drinkable water, as most of the sodium chloride will have escaped the frozen water. Similar 6 is used with salt sprinkled on roads in winter to help get rid of ice and make the roads less 7 .
Another peculiar feature it has is sound conductivity. Because of saline water’s increased density, the speed of sound there is almost five times 8 than in the air.
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