29.(7分,每空1分)(1)生长基因的选择性表达(2)由基因所决定的细胞自动结束生命的过程细胞凋亡在维持生物体内部环境的稳定、抵御外界各种因素的干扰方面都起着非常关键的作用(3)心肌细胞的存活率(或心肌细胞的凋亡率)甲组和丙组心肌细胞的存活率均高于乙组的存活率(或甲组和丙组心肌细胞的凋亡率均低于乙组的凋亡率)丁组加入培养液+心肌细胞+生物制剂Q【解析】(1)由图可知,①过程表示的是细胞生长;③过程表示的是细胞分化,其实质是基因的选择性表达。(2)细胞凋亡是指由基因所决定的细胞自动结束生命的过程;根据题意分析,红细胞和白细胞的功能不同,凋亡的速率也不同,后者的凋亡速率比前者要快得多,该实例体现出细胞凋亡在维持生物体内部环境的稳定、抵御外界各种因素的干扰方面都起着非常关键的作用。

Writing 16Dear peterI read in the newspaper today that a"Learn ChineseCuisine. Enjoy Chinese Foods" Forcigners' Talent Showwill be held in my city television station on July 15th. Iknow you like Chinese cooking, and you are free duringt hat period. I think this is a good chance for you to showyour cooking talent. and how well you've learned Chinesecooking. If you would like to try. you' ll have to go to theTV station to sign up before the end of June. If there isanything 1 can do for you. I would be more than glad tohelpYours.Li Hu

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