pests and diseases are part of nature. in the ideal system there is a natural balance between predators and pests. if the system is imbalanced, one population can (a) increase because it is not being preyed upon by another. the aim of natural control is not to eradicate pests and diseases. it is to (b) restorea natural balance between pest and predator and keep pests and diseases down to an acceptable level. however, pesticides, another option to natural pest and disease control, do not solve the pest problem. in the past 50 years, pesticide use has increased ten times while crop losses from pest damage have doubled. here lies the reason why natural control is (c) chosen more than pesticide use.
색칠부분의 비교대상이 달라 애매한 해석이 됩니다. 정확히 이해되도록 부탁드립니다.
비교대상이 다른데 2배와 10배의 산술적인 계산은 어떤것이 더낫다 아니다를 구별하기 어렵지 않나요 논리적으로 이해가 안되요