画出图形的对称轴．

钙是维持人体正常功能所必需的元素．如图为某种补钙剂“钙尔奇”说明书的一部分．

（1）碳酸钙中碳元素化合价为　____ ．

（2）碳酸钙中钙质量分数　____ ．

（3）服用这种补钙剂，每人每天摄入钙元素的质量为　____ ．

    There is nobody in the world the same as you. You are unique (唯一的)! Everybody is 1 from everyone else. That is2! So it makes the world an interesting 3.

    There are people taller4you, and shorter than you. Maybe your hair is as same  5your friend's, but maybe it is longer than 6. Another difference is your hair may be straight , hers may be curly(卷曲)

    I am sure you have some 7who are smarter than you. And you8have some friends, they are as good 9sports as you. 10there are also people around you who are not good at some things.

    11does your best friend look like? Do you both 12 to finish your homework at school? Do you 13 want to wear the same clothes every day? I think 14 some ways you are the same, but in many other ways you are different.

    So say 15to the world,“I am who I am —I'm unique!”