6.D【解析】未成熟的红细胞中也含有各种基因;葡萄糖氧化分解的第一阶段是在细胞质基质中进行的,在线粒体中葡萄糖不能氧化分解;胰岛∧细胞可分泌胰高血糖素,使血糖浓度升高,胰岛B细胞可分泌胰岛素,使血糖浓度降低。故选D。

Writing 4Dear Mr. blackHow are you doing these days? My classmates and Imiss you very much and often look back on the time wespent together.I know you like drinking tea. Yesterday I posted apackage of green tea to you. which was from the trees onour hill. We picked and processed it all by ourselves. Greenand organic. the tea is rich in nutrition like vitamins, Youcan taste it and will find how nice it is. If you or yourfriends like it. I will post you more later.ave a nice holiday and best wishes to you!Yours.ua

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