化学符号是学习化学的重要工具。
（1）用化学用语(化学符号)表示：①一个硫酸根离子____；②五个银原子____ 。
（2）写出下列符号中数字的意义：①3Cl^-____；②____ 。

写作
题目：（1）宽了的支点
（2）用           书写精彩
要求：①如果选择题目（2），先把题目补充完整，然后作文。
②文体不限，字数不少于600字（如果写诗歌不少于20行）
③字迹工整，书写清楚，卷面整洁（达到此要求，评分时可奖励2分）。
④文中不得出现真实的人名、校名、地名等。

    As they walk down the halls during their years together at Shady Side, our boys and girls —— so soon to become men and women —— are learning to think, to work, to question, to be ____ and ____, to____with others, to laugh at their mistakes and to act ____ when ____ comes their way.

    Sir William Osler, a famous Canadian doctor,____ the value of ____ by saying, "No man is really happy ____ a hobby, and it makes precious little ____ what the outside ____ may be."