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Directions: In the following questions read the passages carefully and choose the best answer to each question out of the four alternatives. 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 whole nation and every winter was a menace. Mountains stood like a barrier between people and people, a 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 pestilence. True, we are still at the mercy of the more violent natural convulsion. Against earthquake, flood and hurricane man has, as yet, devised no adequate protection. At most time, nature is no longer formidable, she has been subdued.

 Modern medicine has helped man

A) to live longer everywhere in the world

B) to live a healthy life in hygienic conditions

C) to live in thickly populated areas without fear of epidemics

D) balance population with available resources