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　　Passage one

　　46. D. “in what way it can be beneficial”

　　根据题目中的定位词(puzzling about)定位到第二段第二句“the puzzle was what benefit would be gained for it”和D选项“in what way it can be beneficial”是同义句替换。

　　47. C “she got some idea from previous studies on birds and dolphins

　　根据题目中的“learn about Dr. Yuka Sasaki doing his research”可定位到第二段第三句第四句 “she also knew from previous work conducted on .... this led her to wonder if people might be doing the same thing”可以得知她从previous work 里边获取一些想法。

　　48. A “she monitored the brain activity of participants sleeping in a new environment”

　　从第二段第五句和第六句“to take a closer look, her team...as they slept in the unfamiliar environment of ... the participants each slept...monitored with techniques that looked at the activity of their brains”可以得知选择A选项。

　　49. C “she exposed her participants to two different stimuli”

　　第三段第一句后半部分“Dr Sasaki re-ran the experiment while...with a mix of regularly timed beeps of the same tone and irregular beeps of a different tone”可以得出答案C。

　　50. B “they tended to perceive irregular beeps as a threat”

　　根据文章最后一句“this is precisely what she found”可以得知答案出现在前一句，文章倒数第二句和C选项意思一样。

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