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S1 : The machines that diver modern civilisation derive their pwer from coal and oil. S6 : Nuclear energy may also be effective used in this respect. P : But they are not inexaustible. Q : Theses soruces may not be exhausted very soon. R : A time many come when some other sources have to be tapepd and utilised. S : Power may, or course be obtained in future from forestes, water wind and witherd vegetables. The proper squence should beA. P Q R SB. Q P R SC. S R Q PD. S P Q R |
| Answer» Correct Answer - C | |