研究发现：吸烟可能有助于减少HIV感染者大脑神经炎症，但存在其他 ...
这项研究发现，吸烟可能对HIV感染者（PLWH）的神经炎症和认知功能产生一定的积极影响。 具体来说，吸烟的HIV感染者比不吸烟的感染者在大脑中有较低的神经炎症水平，并且在认知控制方面的表现更好，尤其是在目标检测等任务中。
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The Arctic town where polar bears and humans live side by side 北极熊和人类彼此 ...
Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient world slept only 6.5 hours a night.
BBC4 天
二、用一分钟阅读下列问题，然后听第二遍音频并回答问题：
Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient world slept only 6.5 hours a night.