GRE考试

【单选题】According to the passage, the case of the Penan foragers’ cultivation of the sago palm fails to indicate that
A、a co-evolutionary argument is unnecessary to establishing that rain-forest adaptation is the effect of human intervention
B、plant-species inimical to carbohydrate-rich species would continue to thrive without the practices of foraging peoples
C、the "thinning" effect produced by the Penan’s foraging practice is responsible for the sago palm’s long-term survival
D、the Penan have justification for abandoning the exploitation of sago palms or relocating to more carbohydrate-rich areas
E、rain forests may evolve as a result of the quantity and availability of extant carbohydrate-rich species
网考网参考答案：B
网考网解析：
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