隔夜莱是否能吃，主要在于烧熟后的隔夜菜中亚硝酸盐含量的变化是否符合食品安全要求。蔬菜中的硝酸盐来自生长过程中所施氮肥。空气中的微生物（如硝酸盐还原菌）进入到蔬菜中，会产生一种还原酶，使蔬莱中的部分硝酸盐还原成亚硝酸盐。烧熟后的莱在食用和保存阶段都会有一些细菌进入；做熟的蔬菜更适合细菌生长。某研究小组对烧熟的莱中亚硝酸盐含量做了测试，数据如下表：

盖有保鲜膜的菜肴在4℃的冰箱中放置不同时间的亚硝酸盐含量（单位：mg／kg）

将一份红烧鲫鱼样本（不盖保鲜膜）在常温下放置4小时，测定其亚硝酸盐含量为8.9483mg/g。

请根据以上材料，回答下列问题：

（1）亚硝酸盐中含有NO₂^-，其中氮元素的化合价是      价；

（2）根据表中的数据，莱中的亚硝酸盐含量变化的共同规律是                 ；

（3）要使烧熟后的隔夜莱中亚硝酸盐含量尽可能低，保存的条件应该是               ；

（4）炒菜过程中温度一般在100℃以上，你认为从生莱炒到熟菜过程中的亚硝酸盐含量是否会持续增加        ，原因是                                              。

下列说法中错误的是（     ）

根据拼音写汉字：

根据短文内容及首字母提示，填写所缺单词，使短文意思完整。每空限一词。
    Do you like your parents? They're two most i____people in your life. I think so. Because they're likely to influence you more than anyone e____ you have met and will meet. So if your dad worships a football team, s____ as Pittsburgh Steelers and Atlauta Falcons, you are likely to grow up being a big fan of a football team. And if your mom loves to r____ , you might grow up just carrying a book wherever you go, just a____she does.
    But parents do a lot more than just pass along their h____ . Moms and Dads need to care for their kids from the m____they're born. It's parents' task to love and guide kids---and most parents will do this as l____ as they live----even when the "kids" have g____up and have children of their o____ . That means you have many years ahead to share with your mom and dad.