金卷答案
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22.解：(1)以极点0为原点，极轴为x轴正半轴，建立平面直角坐标系x0y,由x=pcos0,y=psin6,得点C,M的直角坐标分别为C(3,3),M(0,3),所以圆C是以(3,3)为圆心，3为半径的圆，其方程为(x-3)2+(y-3)2=9.即x2-6x+y2-6y+9=0.…3分所以圆C的极坐标方程为p2-6p(sin0+cos0)+9=0.5分(2)将0=a代人圆C的极坐标方程得p2-6(sina+cosa)p+9=0,由A=36(sin+cosa)2-36>0得，im2m>0,因为0≤a
这是一篇说明文,心理学家们将人们睡在陌生的床上通常无法入睡的现象称为“第一晚”效应,文章内容对睡眠环境和研究者的调查与结论进行阐述。2.D细节理解题。根据第二段第二句 The puzzle was what benefit would be gained from itwhen performance might be affected the following day. nn33.A细节理解题。根据第三段的第一句 To take a closer look, her team studied3 5 healthyeople as they slept in the unfamiliar environment of the university s Department ofPsychological Sciences可知34.C细节理解题。根据最后一段第一句 Curious if the left hemispheres were indeedremaining awake to process information detected in the surrounding environment, Dr. Sasakire-ran the experiment while presenting the sleeping as35.B推理判断题。根据最后一段第二句 She worked out that, if the left hemisphere wasstaying alert in a strange environment, then it would react to the irregular beeps by stirringpeople from sleep and would ignore the regularly timed ones. n]5nl
