阅读下列材料，为白求恩同志写一段颁奖词。
材料：诺尔曼·白求恩（1890—1939），国际主义战士、加拿大共产党员、胸外科医师。1936年德意法西斯侵犯西班牙时，他曾经亲赴前线为反法西斯的西班牙人民服务。1937年中国抗日战争全面爆发，他率领由加拿大人和美国人组成的医疗队，于1938年初来中国，3月底到达延安，不久赴晋察冀边区，在那里工作了一年多。在一次为伤员施行急救手术时受到感染，1939年11月12日在河北唐县病逝。

阅读理解

People communicate(沟通)in many different ways．The most common way is by talking with others．Besides talking，we can also use body language．When we use body language，we need to use body to show what we mean．Sign language is a kind of body language．Let’s see more about it．

  Sign language is popular among dumb people who are unable to speak or don’t want to speak．If you want to communicate with a foreigner，but you can’t speak his language and he can’t speak Chinese，what can you do?Maybe you can communicate by making signs．Now let’s learn some signs Indians often use．

    *When they are hungry，they move their right hands back and forth in front of their stomachs．

    *When they mean“Let’s eat”．they put their right hands and move them up and down in front of their mouths．

    *When they have had enough，they part their thumbs and first fingers,and move their hands from their chests to chins．

    *If they have a stomachache，they put both hands on their stomachs，and move them back and forth．

已知函数f（x）满足f（x﹣1）=x²﹣x+1，则f（3）=____．

分类法是化学研究的重要方法。以下分类错误的是（   ）

根据旬意和首字母提示完成单词。