高考金卷·2023届高三·D区专用 老高考(二)地理答案

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【答案】(10分，每空2分)(1)DNA10(2)一深一浅半保留(3)80【解析】(I)胸腺嘧啶脱氧核苷酸是DNA特有的，所以利用3H标记的TdR在间期参与合成DNA,DNA在实验开始时被标记。B表示标记细胞进入分裂期，C表示标记细胞第二次进入分裂期，所以该细胞分裂一次平均经历的时间大约为13一3=10(h)。(2)已知只有双链均含BrU的染色单体着色较浅，其他情况的染色单体着色较深。现以1条染色体为例，观察加入BrdU后细胞分裂中期的着色情况，由于DNA分子进行半保留复制，所以经过2个周期，所产生的c细胞中一半细胞为两条染色单体均着色浅，另一半细胞为两条染色单体一深一浅。(3)若检测的结果是G1期核DNA的相对含量为40，S期核DNA复制加倍，则G2期核DNA的相对含量应该是80。

第二节书面表达（满分25分）假定你是李华，在你校体育节来临之际，给学校英文报写一篇短文分享锻炼经历，倡导体育锻炼。内容包括：1.锻炼经历；2.给学校加强体育锻炼的建议；3.你的倡议。注意：1.词数100左右；2.可以适当增加细节，以使行文连贯。Participating in More Physical ExerciseWith our school's annual Sports Day approaching,I can't help thinking of my sports experience.As I enteredthe senior high school,I had much pressure from study,and my health was worsening.My father pushed me torun in the morning.I kept running and running until it became habitual.Not only has morning running betteredmy health,it has also built up my strong character,thus improving my studies.Since physical exercise is extremely beneficial to our health,I suggest that our school should provide moresports space and more sports facilities for students.Above all,students should be given more sports time.Forexample,our school can organize more after-school activities like basketball match,football match,running andso on.More physical exercise and we'll enjoy better health,better mood and better academic performance.Let'sparticipate in more physical exercise!