题目

There exist cruel wars, fighting and sadness in the world today, so it’s not only necessary, but also essential to have a good sense of humor just to help us go through difficult times in out lives. Putting a smile on someone’s face when you know they are feeling depressed, as the saying goes, makes me feel good and warms my heart. How would you feel if you could not joke around with wife, husband, child, co-worker, neighbor, close friend, or even just someone that you are standing in line with at your corner store? I am always saying things that make others smile or laugh, even i11．请用化学用语填空：（1）2个镁离子2Mg2+；（2）氧化铁中铁的化合价$\stackrel{+3}{Fe}$2O3．