下列有关元素化合物的叙述中正确的是
A．钠在空气中燃烧生成白色的氧化钠固体
B．检验FeCl2溶液中的少量Fe3+，可以用KSCN溶液
C．二氧化硫的水溶液能使紫色石蕊溶液变红，但不能使之褪色
D．普通玻璃的组成可用Na2O·CaO·6SiO2表示，是纯净物
BC
题目分析：A.钠在空气中燃烧成过氧化钠，是淡黄色，错误；B.利用Fe3++3SCN-=Fe(SCN)3，生成的Fe(SCN)3显血红色，而Fe2+则没有这样的性质，正确；C.二氧化硫溶于水生成亚硫酸使石蕊试液变红，但不能使其褪色，正确；D.普通玻璃的成分是硅酸三钙、硅酸二钙、铝酸三钙，是混合物，错误。
| 阅读下面短文，根据上下文，丛文后方框内选出适当的选项填入文中空白处，使短文内容完整正确， 然后完成第5小题。 | |
| We live with them, and grow up with them. They work hard, take us on exciting holidays, give us food, clothes and take good care of us. However, we often shout at them, make their living area noisy and dirty and expect that they always understand and love us! 1______ They are, of course, our parents. 2______ There are so many changes (变化) and so many problems, and there is so little experience to help us teenagers. Our bodies and minds are changing fast, and all the changes and problems can be scary. In fact, many of the answers to these difficult problems can be found from our parents. 3______ Also, the more we get to know our parents as people, the more we understand that it is only because they care for us, even when they are angry with us. Take the time to share (分享) in your parents' lives: Go fishing with Dad, help Mom cook the evening meal, and really talk to them. Often you will be surprised by what they will tell you. 4______ So, start with something simple and see what wonderful things can follow...
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| 5. Which one is NOT TRUE according to this article? | |
| A. Teenagers expect that their parents always understand and love them. B. This article can help teenagers get on well with their parents. C. It is necessary for teenagers to take the time to share in their parents' lives. D. It's pleasant for teenagers to meet so many changes and problems. |