题目

阅读理解Beccawas 6 when she was told she had cancer on Sept. 8, 2014. She clearly remembers thebad days of her 26 months of non­stop treatment. Luckily, Becca celebratedher final treatment on Nov. 13, 2016, and she has been cancer­free ever since. But she was thinking about what her life was like whileexperiencing treatment. I wasnever able to do much, and that's what the kids lying in their hospital beds rightnow experience, asking their mom and dad, “When are we leaving? When can I playwith my friends？” So I decided I have to help them. In February,2017 Becca came up with the ide苹果含有Zn2+，Zn2+是形成与记忆力息息相关的蛋白质不可缺少的元素。儿童缺Zn2+，就会导致大脑发育不完善，因此，苹果又被称为“记忆之果”。这说明无机盐离子 A．对维持酸碱平衡有重要作用                   B．对维持细胞形态有重要作用 C．对调节细胞渗透压有重要作用                 D．对维持生物体的生命活动有重要作用