四、文意選填 （共 20 題 每題 1 分 20%） 
(A) Agriculture is the basis of modern civilization. Because of agriculture, cities as well astrade relations between different regions and groups of people developed, 57 enablingthe advancement of human societies and cultures. Over the centuries, agriculture hasundergone significant developments to meet the rising 58 of an ever growing globalpopulation. Large scale factory farming techniques and machines greatly enhanceagricultural 59 . The seemingly promising prospect of agribusiness does pose a threat toenvironmental sustainability, 60 . The commonly-used chemicals and fertilizers areseeping into groundwater and soil is being 61 of nutrients. To stop this kind of harmfulfarming, some conservation-oriented farmers ardently 62 sustainable agriculture tomaintain the sustainability of farming land. They farm organically or cut down on the use ofsynthetic fertilizers and pesticide, 63 reducing chemical runoff. Moreover, they growand rotate diverse crops so that soil is 64 . On top of that, they do not focus onimmediate effects, but 65 on naturally occurring biological processes, which often takeplace over extended periods of time. With this ecological 66 to agriculture, they hopeto strike a balance between natural resource conservation and agricultural productivity. 
(A) engage in
(B) further
(C) though
(D) demand
(E) rather(F) approach (G) yields (H) depleted (I) thereby (J) replenished
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