题目

阅读理解 The Loss of Innocence Innocence is such a precious gift. It's explained as freedom from guilt or wrong doing. Just imagine never having to worry about anything and having a guilt free mind. Some people wish to save this kind of innocence from being lost from childhood to adulthood. What would the world be like if innocence were never lost? One way it would benefit humanity is the lack of hatred (仇恨)among the world. During youth, there may be an occasional argument, even a little physical fight, but nothing like firing a handgun at a fellow human being. And children are bli通过测定混合气中O2含量可计算已变质的Na2O2 (含Na2CO3) 纯度,实验装置如图(Q为弹性良好的气囊)。下列分析错误的是A. 干燥管b中装入碱石灰B. Q气球中产生的气体主要成份O2、CO2C. 测定气体总体积必须关闭K1、K2,打开K3D. 读完气体总体积后,关闭K3,缓缓打开K1;可观察到Q气球慢慢缩小
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