英语周报 2018-2022 高一 新答案

Paragraph 1Several days later, when Jenny's father came in toread her a story, Jenny was waiting anxiously for him on thebed. When listening to the story Jenny was totally absentminded, with her hands holding the necklace tightly andfirmly. When the story came to an end, unexpectedlyJenny offered her beloved necklace to her father, with herfingers trembling automatically. No one knew what thenecklace meant to her. She whispered to her father, softlyand gently, "Daddy, you know I love you more than thenecklace. "Then the necklace slid into her father's handsdeterminedlyParagraph 2Holding the plastic pearl his daughter offered, thefather dragged out a blue box. Much to Jennys amazement, a beautiful real pearl necklace lay peacefully in thebox, which set her heart racing. Jenny froze there,athrilled expression twisting her face. Before Jenny was ableto say something, her father brushed a warm kiss on herface and gathered her into his arms. Holding the genuinenecklace in her hand, Jenny lifted her lip, tears beginningto blur her vision

22(答案】(1)(1分)L(1分)(2)会(1分)8m(2分)关键能力】本题考查测量做直线运动的物体的速度,意在考查考生对实验原理的理解、处理实验结果的方法迁移和分析能力。【解题思路】(1)微型计算机计算汽车定点速度时是用短时间内的平均速度代替瞬时速度,所以汽车定点速度的表达式=4,区间测速测的是平均速度,故=上。(2)根据=4得n=7ms=20m/s0.380km/h,汽车超速,故照相机会工作;要保证测速区间内不超速,汽车在两地之间运动的时间至少为1=言=80km/hL20=0.25h=900s,设汽车到区间中点时速度达到最大,为n,根据平均速度公式有百=+=,解得vn=120kmh,则汽车在前一半加速和后一半减速过程的加速度100100大小均为a=2-2=3.9ms2=4m/s2450思维拓展》本题联系实际将定点测速和区间测速设计到一个实验中,解题时要对实验的条件进行仔细分析,根据相关原理和实际情境进行列式求解

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