人教版高一英语周报2021-2022答案

13.(1)BC(2分)(2)0.810(2分)(3)9.80(2分)【解析】本题考查利用单摆测定重力加速度。(1)组装单摆须选用密度较大且直径较小的摆球,选项A错误组装单摆须选用轻且不易伸长的细线,选项B正确;实验时须使摆球在同一竖直面内摆动,选项C正确;单摆的摆角不得超过5°,否则单摆的运动就不能视为简谐运动,选项D错误。(2)小球直径d=8mm+0.05mm×2=0.810cm(3)单摆的周期为T=由单摆周期公式可得T40,则有r:160016002dL由题图丙可知g斜率、1600丌1610100×10s2/m=1610s2/m,解得g≈9.80m/s2o

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

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