Q.No.(76-80): Read the following passage carefully and answer the questions given below. In the past, man's worst enemy was Nature. He lived under the continual threat of famine and pestilence; a wet summer could bring death to the whole Nation and every winter was a menace. Mountains stood like a barrier between people and sea was less a highway than an impassable division. Today Nature, though still an enemy, is an enemy almost completely conquered. Modern agriculture assures us of an ample food supply. Modern transportation has made the resources of the entire planet accessible to all its inhabitants. Modern medicine and sanitation allow dense populations to cover the ground without risk of epidemic. True, we are still at the mercy of the more violent natural convulsions. Against earthquakes, flood and hurricane, man has, as yet, devised no adequate protection. At most times, Nature is no longer formidable; she has been subdued.