8.C【解析】本题主要考查阿伏加德罗常数及其计算,侧重考查学生整合化学知识的能力。电解MgSO4溶液的本质是电解水,电解0.1molH2O,转移的电子数为0.2NA,A项错误;100g质量分数为46%的乙醇溶液中含有46g乙醇和54g水,所含氢原子的数目为12NA,B项错误;1L0.1mol·L-1NaOO3溶液中,CO水解生成HCO和OH-,阴离子总数大于0.1NA,C项正确;100ml12mol·L-HNO3溶液与过量Cu反应,若HNO3与Cu反应只生成NO2,则转移的电子数为0.6NA但随着HNO3浓度的降低,稀HNO和Cu反应的还原产物为NO,转移的电子数大于0.6NA,D项错误

解题导语】这是一篇说明文。文幸讲述了书香环境对于孩子成长的好处32B推理判断题。根据第二段中“ Radiation effect is a situationwhere children grow up around books, but they don't readbooks. But somehow books benefit then, even thoughthey don't read them as much as their parents wish themo”可知,辐射效应在本文中指在书香环境中长大的孩子虽然他们没有像父母期待的那样读那么多的书,但他们仍然从书中受益良多。由此推断出,书香环境对青少年的良好影响,故选B这A理判断题。根据第三段中“ If we grow up in a house,ina home where parents enjoy books, where books are givenas birthday presents and valued, this is something thatbecomes a part of our identity and gives us this lifelongurge to always come close to books and read more than we I则ld呵可知,如果我们生长在父母热爱书、珍惜书的家庭中,这将成为我们认知中的一部分,让我们终身都有接近书,多读书的渴望、故选A现点态度题,根据最后一段中“ So keep shelves piled with30y所以书柜里装满书吧,由此可知,作者对于书香环境是支持的,故选DsC主旨大意题,根据全文的大意,尤其是第一段中“weknow that reading is good for children. Now, a new studysuggests that just being around books has its benefits. "pJ,本文主要讲述了书香环境对孩子成长的好处。故选

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