咏雪

    谢太傅寒雪日内集，与儿女讲论文义。俄而雪骤，公欣然曰：“白雪纷纷何所似？”兄子胡儿曰：“撒盐空中差可拟。”兄女曰：“未若柳絮因风起。”公大笑乐。即公大兄无奕女，左将军王凝之妻也。

陈太丘与友期

    陈太丘与友期行，期日中，过中不至，太丘舍去。去后乃至。元方时年七岁，门外戏。客问元方：“尊君在不？”答曰：“待君久不至，已去。”友人便怒曰：“非人哉！与人期行，相委而去。”元方曰：“君与家君期日中，日中不至，则是无信；对子骂父，则是无礼。”友人惭，下车引之。元方入门不顾。

     My parents used to tell me how important school was for me, but I didn't think so. I paid little attention to it. But one thing let me finally 1 what my parents meant.
     One day, when I   2   a mobile phone store, I saw an advertisement on its door. It was hiring new workers!
“Sir, are you hiring people?” I went   3  the shop and asked. “Yes, but you should be the man who we need,” the manager answered. He looked at me for a few   4 from head to foot. “Do you have a high school diploma(文凭)?” 5 he, “Or do you have any work experience?”
    I felt so ashamed and  6 that I didn't know what to say, so I just turned around and left. I could not fall asleep that night, and I thought a lot about my  7  . “I must go to school or I can’t do anything without a good education,” I  8 to myself silently. I never went back to the store again 9 I finished my study and got a diploma.
10 looked the same when I returned to the store: the same people and the same design. However, compared with last time, I had more  11  . The manager told me they needed new    12  . So it was a great chance for me.
    I 13  my diploma to the manager. He looked at it and said, “Great, you are in.”
    Now I am still working in the same store. With this experience, I always  14 people to attend school. Education helps you have a bright future. Now I am not worried about my future because I'm still   15in my spare time.

①天然气的主要成分____   ②具有还原性的有毒气体____  ③碘酒的溶剂是____ ④可用于治疗胃酸过多的是____ ⑤可作食品干燥剂的物质是____

解释下列词语

①贪婪    

②刹那间