两体积相同的小石块和小纸团，在同一位置以相同的速度竖直向上抛出。在没有空气阻力的

     A generation gap has become a serious problem. I need a __1__ about it in the newspaper. Some
children have killed themselves after quarrels with __2__. I think this is because they don't often have
a talk with each other. Parents now __3__ more time in the office, __4__ they don't have much time
to stay with their children. As time passes, they both feel that they don't have the __5__ topics to talk
about. I want to tell parents to be more with your__6__, get to know them and __7__ them. And for
children, show your __8__ to your parents. They are the people who love you. So __9__ them your
thoughts. In this way, you __10__ have a better understanding of each other.