20222022八上英语周报答案

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

25.【答案】B【命题意图】本题考查遗传病类型的判断、遗传系谱图中遗传方式的判断和计算、自由组合定律的应用的知识,考查理解与表达能力、获取与处理信息的能力、综合运用能力,考查科学思维、社会责任的学科素养【解题思路】本题涉及了两对等位基因控制的遗传病的遗传方式,假设控制该病的基因为A/a、B/b,题中都可以单独致病”是解答本题的关键。由于I、I2正常,而3患病,l3、I4正常,而l患病,可判断该遗传病属于常染色体隐性遗传,A错误;根据题意可知,两对基因可单独致病,因此只有基因型为A_B表型正常,又由于Ⅱ3和Ⅲ的后代Ⅲ1正常,所以Ⅲ1基因型肯定是AaBb,Ⅱ3和Ⅱ4基因型分别是AAbb、aaBB(或aBB、AAbb,由于第二种基因型的遗传情况与第一种类似,故本题仅以第一种情况举例),所以I、I2基因型是AABb、AABb,I3、I4基因型是AaBB、AaBB,则Ⅲ1基因型及概率为1/3AABB或2/3AABb,Ⅱ基因型及概率为1/3AABB或2/3AaBB,则Ⅲ1和I的基因型相同(都为AABB)的概率为1/3×1/3=1/9,B正确;Ⅲl(AaBb)与人群中表现正常男性(A_B_)婚配,后代存在患病的可能性,故有必要进行遗传咨询,C错误;Ⅱ2基因型及概率为1/3AABB或2/3AABb,Ⅱ5基因型及概率为1/3AABB或2/3AaBB,若Ⅱ2与Ⅱ婚配,后代不携带致病基因(AABB)的概率是4/9,则携带致病基因的概率是5/9,D错误。

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