在抗美援朝战争中涌现出无数的战斗英雄，其中“严守纪律，被大火吞噬而壮烈牺牲”的是：（  ）

已知C（s）+H₂O（g）═CO（g）+H₂（g）△H=akJ•mol^﹣1   2C（s）+O₂（g）═2CO（g）△H=﹣220kJ•mol^﹣1H﹣H，O=O和O﹣H键的键能分别为436、496和462kJ•mol^﹣1，则a为（   ）

篇段积累——默写《十五从军征》片段。

      中庭生旅谷，井上生旅葵。____，____。____，____。出门东向看，泪落沾我衣。

从分别写有1，2，3，4，5的五张卡片中任取两张，假设每张卡片被取到的概率相等，且每张卡片上只有一个数字，则取到的两张卡片上的数字之和为偶数的概率为(    )

    I started to learn English when I was six. My dad gave me1advice on listening to the Beatles. I listened to them every day for the next seven years. At the beginning, I could understand2of what they sang. But soon I started to understand some of the3.

    4 I got a book with the words of all the songs. And when I had time, I would read it. I learned many songs5this book. I6the songs to myself. Still, I understood very7of the meaning. To learn English well became my8, and I wanted to learn the9of the Beatles' songs. That is how I started to learn English.

    Today, I can understand the Beatles very10. Each time I hear a Beatles' song, I am happy and proud because my dream of learning English well has come true.