38.B【解析】题意:关于实验参与者下列哪项的叙述是正确的?
A项意为实验参与者学会了如何控制MRI机器,文章只有第五段第一句The volunteers were a gain placed in MRI machines出现MRI machines这个词,而本句与A项毫不相干,所以A项错误。根据第五段第二、三句The participants were asked to somehow regulate activity in the posterior part of the brainto make a solid green disc as large as they could.They were told they would get a paid bo nus proportional to the size of this disc,but they werent told anything about what the disc meant可知 B项实验中没有告知他们要学到什么正确,与文中说法相符。C项意为他们参加实验会获得报酬,而上文的意思是他们被告知会得到与disc大小成正比 的一笔奖金,bonus意为奖金,故C项错误。D项意为他们不配合实验,与文意不符,实际上学者们很顺利地完成了实验,所以D项错误。故选B。
39.B【解析】题意:这项研究结果意义重大在于学习。
根据文章第八段The most surprising thing in this study is that mere inductions of neural active-tion patterns corresponding to a specific visual feature led to visual performance improvement on the visual feature表明人们可以观察到大脑活动,包括学习。这也是正是此项研究的意义所在。故选B。A项与D项文章并未提及,故错误。
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