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【单选题】
According to the passage, the case of the Penan foragers' cultivation of the sago palm fails to indicate thatA.
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
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举一反三
【单选题】生物反馈技术的原理和方法不包括
A.
通过电子仪器描记生理信息
B.
学习调节和控制自身的生理活动
C.
生物反馈的种类包括肌电反馈、皮肤电反馈、脑电反馈、血压反馈等
D.
是放松疗法和生物反馈技术的结合
E.
可防治感染性疾病
【简答题】电焊条由 和 组成
【简答题】旅客运输组织工作要从方便旅客出发,全面安排,按照长短途列车分工换乘优先、()的原则