题干

 阅读下面的短文并回答问题.

纯净的氮气是一种无色、无味气体,在放电的条件下,氮气和氧气能直接化合生成无色的一氧化氮,一氧化氮不溶于水,在常温下很容易跟空气中的氧气化合,生成红棕色并有刺激性气味的二氧化氮,二氧化氮有毒且易与水反应,生成的硝酸随雨水落到地上,同土壤中的矿物质作用,形成能被植物吸收的硝酸盐类.

(1)氮气的物理性质是____ .

(2)实验室制取一氧化氮时,可采用____方法收集.

(3)二氧化氮与水反应的化学方程式为3NO2+H2O═2HNO3+X,则X的化学式为____ .

(4)“雷雨发庄稼”是“雷雨”为农作物提供了氮肥,硝酸铵是农业上常用的氮肥,在使用时不能与____混合施用,避免产生氨气,降低肥效.

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无色、无味气体,排水法,NO,碱性物质

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    Last April, on a Sunday, we took one of our “nowhere” drives. My husband was quietly driving along a back road. I was occupied in the front passenger seat watching the scenery.

    I noticed out of the corner of my eye that my husband was struggling to look out of my window. This frightened me, since his eyes should be on the road in front of him. I asked him what he was looking at out of the windows, and he quietly replied, “Nothing.”

    After a few minutes, I looked over at my husband and noticed a tear running down his cheek. I asked him what was wrong. This time he told me, “I was just thinking about Pop and a story he had once told me.” It had something to do with Pop, his friend from childhood, and I wanted to know the story, so I asked him to share it with me.

    He said, “When I was 8 years old, Pop and I were out fishing and he told me that the pine trees know when it is Easter.”

    I have no idea what he meant by that, so I pressed him for more information.

    He continued on… “The pine trees start their new growth in the weeks before Easter because spring is drawing near. If you look at the tops of the pine trees, you will see the yellow shoots. As the days get closer to Easter Sunday, the tallest shoot will branch off and form a cross. By the time Easter Sunday comes around, you will see that most of the pine trees will have small yellow crosses on all of the tallest shoots.”

    I turned to look out of the window and I couldn't believe my eyes. It was a week before Easter, and you could see all of the trees with the tall yellow shoots stretching to the sky.

    The tallest ones shone in the sunlight like rows of tiny golden crosses. May you find your Easter season filled with beautiful golden crosses!