申論 3閱讀測驗：下列選文後有五個問題。請仔細看完選文後，從每題的、、、四個選項中，選出最適當的答案。（10 分）One key to the stability of natural systems is the diversity of plants, insects,and animals that live in them. If nature is left undisturbed by humans, it naturallyevolves ecosystems with incredible diversity, leading to many inter-connectednegative feedback loops that suppress disruptive changes. Recent research showsthat diverse plant ecosystems are not only more resilient and robust, they’re alsomore productive and consume more CO. On the other hand, when humansmanage an ecosystem to maximize output, they typically create a monoculture－just one crop with as few weeds and insects as possible. In the short run, asimplified ecosystem gives humans rich returns of that one crop. But it’s alsovery vulnerable. Because any single crop falls easily to unexpected loss, farmersshould plant diverse crops and rotate them on their fields. The researchersstudying productivity from biodiversity have found that polycultures of about tenspecies produced the greatest bioproduct.1. Which of the following statements is the best summary of this passage？As diverse ecosystem is more productive, each agricultural systemshould try to maintain a polyculture of about ten species.Since ecosystems are naturally diverse, it is morally wrong to disturbthem.The stability of natural systems are maintained through biodiversity.In the short run, a simplified ecosystem gives humans rich returns to thatone crop.2. In a healthy ecosystem, “negative feedback loops” aredisruptive and should be suppressed.numerous and inter-connected.disturbed by humans.equivalent to biodiversity.3. A monocultureis the most productive of all systems.is vulnerable and can collapse easily.gives rich returns in the long run.is resilient and robust.4. The author advises farmers to plant diverse crops and rotate them on theirfields becausesingle crop falls easily to unexpected losses.diverse plant systems are most productive and consume more CO.researchers found polycultures of about ten species produced the greatestbioproduct.all of the above5. Which of the following is true according to this passage？The more diverse a natural system is, the more stable.Maximum output of a single crop may be harmful to the whole system.Human intervention in a natural system is often counterproductive.All of the above