现进行如下实验操作（所加试剂均过量）：

把下面几个句子组成语意连贯的一段话，排序正确的一组是(    )

    ①鸡蛋、石蜡等在液态空气里，会像萤火虫似的射出荧光。②鲜花在液态空气中浸一下，就变得像玻璃一样脆，一摆动，便叮当叮当直响。③在零下190多摄氏度，空气竟变成了浅蓝色的液体，叫做“液态空气”。④在零下一二百摄氏度，就叫超低温。⑤鸡蛋射出的荧光是浅蓝色的，石蜡射出的荧光是浅绿色的。

阅读材料，完成下列问题。

    河套灌区是我国设计灌溉面积最大的灌区，也是我国主要的商品粮基地。河套灌区属于没有引水灌溉便没有农业的地区，该灌区年引黄河水量为50亿立方米，占黄河过境水量的七分之一。灌区农作物灌溉分夏灌、秋灌和秋后灌三个阶段，夏灌从每年5月上旬到6月底，秋灌从9月初到9月中旬。这两个阶段的灌水都是农作物生长期的灌溉。秋后灌溉是作物收割后的储水灌溉，每年从10月初开始到11月初结束，是该灌区一年中灌水量最大的一次。长期以来，河套灌区由于灌水较多，而排水工程没有跟上去，土壤盐碱化日趋加剧，严重影响灌区农牧业生产的发展。下图为河套灌区区域图。

（A）NaOH+HCl=NaCl+H₂O    （B）2FeCl₃+Cu=2FeCl₂+CuCl₂

阅读理解

     Linda was a sixteen-year-old girl in Canada. She was feeling bad for several days. Her mother took her to a hospital and the doctors found out that she had cancer.

     Linda's life changed. She began to go to the hospital often for treatment（治疗）, and she also became depressed.

     The hospitals and the doctors were good, but Linda did not have hope herself. Linda's mother called a flower shop close to the hospital. “I want some beautiful flowers for my daughter. She is a teen girl with cancer.” She told the shop owner.

     Later, the flowers arrived. Then Linda saw something unusual. It was a card. It read:Linda, I own (拥有) this flower shop. I had cancer when I was fifteen years old. I am 24 years old now. Good luck. My heart goes out to you.

                                                                              Yours,

                                                                               Alice

     Linda smiled. She finally felt some real hope. She found the will (意志) to 1ive.

     Little things make a big difference. All of us can give little things like kindness, encouragement and hope to others.