读后续写Possible version lI stared at the paper and then looked around. I was cold. Although I could not see my sistersnor the new house, which was hidden from my sight by a grey wall, I got the feeling that I was notalone. Walking along the shore was a tall familiar figure who looked lost in his thoughts. I lookedgain at the paper in my hand, closed my eyes and wishedAs /opened my eyes, I found my father was standing right beside me. Happy birthday, sonhe said, patting my shoulder gently. I smiled up at him and took his hand. Looking back, life fromthat day on marked the start of a close bond and a strong friendship with my father. What was mybirthday surprise? Wishes do come truePossible version 2I stared at the paper and then looked around. On the backside, there was a map. I noticed thatit was clearly leading me in a direction, but who could have sent this? I stood there in silence andstudied it. I decided to follow the map and it led me down the beach until I reached a staircase. Iooked back and could no longer see my siblings. I continued to follow the point on the map, untilI unexpectedly lost my footing and fell zksq down the stepsAs I opened my eyes, I found my father was standing right beside me. Happy birthday, sonhe said, patting my shoulder gently. Then he asked how I had come upon this place? I explained tohim that I had found the bottle in the ocean and when I opened it had the words on it. Shocked bythe message, my father realized what I had found I threw this bottle into the ocean many years agowhen I was alone. he said. I used to come to this exact place to get away from everyone else. NowI get to share this experience with you. What a birthday surprise

12.AB【解析】动滑轮处于静止状态,由平衡条件得绳子的拉力T= mosin45°=2mg,物体A刚好要滑动,受力平衡,根据平衡条件得T= magin30°+pmgs30°,解得m=2m,A项正确;开始时悬挂动滑轮的两绳均竖直则绳子的拉力T1=">magin30°,开始时物体A受到的静摩擦方向向下,当P向右移动时,绳子的拉力一直增大,根据平衡条件可知物体A受到的静摩擦力也一直增大,B项正确;悬挂动滑轮的绳子竖直方向上的分量TmE,所以斜面体对地面的压力等于斜面和物体A的重力与之和不蚕,项错误;设悬挂动滑轮左边的绳子与水平方向的夹角为,对斜面体和物体A整体研究,水平方向由平衡条件得∫=Tcos0,P向右移动的过程中,T增大,减小,则f增大,D项错误。

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