以上能导电的是____（填序号，下同）；

以上属于电解质的是____；属于非电解质的是____；

写出属于酸式盐的物质溶于水后的电离方程式____．

依次填入下面横线处的词语，衔接最恰当的一项是（    ）

    画中央的地平线上是一轮火红的太阳。天空的颜色五彩缤纷——首先是一层紫罗兰的迷雾，         ；         ；         ；         。         ，          。

①太阳附近是朱砂色的反光，但是它的上面是一溜黄色的云霞

②紫罗兰色与灰色的云朵到处接收来自太阳的反应色

③它变成绿色，后来又变成蓝色，既所谓的天蓝色

④红日在雾中被镶着灿烂而漂亮红边的一片深紫色的云遮住一半

⑤但是却充满光的颤动，在色彩美丽的地里，沟中的水闪着亮光

⑥ 大地好像是一条绿色、灰色与棕色的地毯

学习化学可以了解日常生活中某些变化的本质，下列变化中属于化学变化的是（   ）

    Last Christmas while staying with my parents, I 1 across some old love letters that my parents wrote to each other. These letters were all piled up in a basket, dirty and 2 with dust.3 to read and sort them, I asked them if I could take the letters back to my Illinois home. They agreed.

    As I carefully opened each letter, all of them delicate with age, I discovered a new page 4unknown to me in this private chapter of my parents' lives.

    My father used to 5 in the army. So his letters were full of frontline  6 of the things about the war. Each of my mother's letters was marked 7 her 1944 dark red lipstick kiss. I was 8 to these letters like a magnet (磁铁).

    Just six weeks after our Christmas visit, Daddy became very 9and was hospitalized. This time, he was fighting a 10 kind of war. As I sat by his bedside, we discussed the 11 . He told me how much receiving those lipstick-kissed letters had 12to him when he had been so far from home.

    It so happened that the next day would be February 14. From the 13letters I chose the card my father had sent Mother in 1944 and brought it to my father's bedside.

    At his bedside, I joked with him, saying 14, “Today is Valentine's Day, don't you want to send Mother a present?” He became more 15when I handed him the old 16. He carefully opened it and took out the card, and when he 17 it, his eyes were filled with tears.

    My father, in a voice tight with18read the loving19he'd sent to my mother fifty-six years earlier. And this time, he could read it to her 20.