4. The author advises farmers to plant diverse crops and rotate them on their fields because
(A) single crop falls easily to unexpected losses.
(B)diverse plant systems are most productive and consume more CO2.
(C) researchers found polycultures of about ten species produced the greatest bioproduct.
(D) all of the above

5. (A) afraid (B) entangle (C) insulate (D) paranoid

1. Which of the following statements is the best summary of this passage？ (A) As diverse ecosystem is more productive, each agricultural system should try to maintain a polyculture of about ten species. (B) Since ecosystems are naturally diverse, it is morally wrong to disturb them. (C) The stability of natural systems are maintained through biodiversity. (D) In the short run, a simplified ecosystem gives humans rich returns to that one crop.

2. In a healthy ecosystem, “negative feedback loops” are (A) disruptive and should be suppressed. (B) numerous and inter-connected. (C) disturbed by humans. (D) equivalent to biodiversity.

3. A monoculture (A) is the most productive of all systems. (B) is vulnerable and can collapse easily. (C) gives rich returns in the long run. (D) is resilient and robust.

5. Which of the following is true according to this passage？ (A) The more diverse a natural system is, the more stable. (B) Maximum output of a single crop may be harmful to the whole system. (C) Human intervention in a natural system is often counterproductive. (D) All of the above

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