15.The author concludes that historical changes would ________ . (A) be delayed without leaders with inspiring personal qualities (B) not happen without heroes making the necessary sacrifices (C) take place if there were heroes to lead the people (D) produce leaders with attractive personalities

18.By saying "While it’s true that... be they scientific or artistic" (Lines 1-3, Para. 5),the author means that _____. (A) business management should be included in educational programs (B) human wisdom has accumulated at an extraordinarily high speed (C) human intellectual development has reached new heights (D) the importance of a broad education should not be overlooked

15.The author concludes that historical changes would ________ .
(A) be delayed without leaders with inspiring personal qualities
(B) not happen without heroes making the necessary sacrifices
(C) take place if there were heroes to lead the people
(D) produce leaders with attractive personalities

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