It is ______ to spend money in preventing illnesses by promoting healthy living rather than spending it trying to make people ______ after they are ill.
第二部分:英语知识运用(共45分)
第一节:单项填空(共15小题;每小题1分,满分15分)
_______ good knowledge of several languages is essential to _____ study of comparative literature because without it one can read books only in translation.