如图所示的实验中，用来探究电磁铁磁性强弱与哪些因素有关的实验是（　　）

    Chinese writing began thousands of years ago. According ____ an ancient story, a man named Cang Jie invented Chinese writing. One winter day while he was hunting, he saw the ____(track) of animals in the snow and ____(observe) that the appearance of each one was different. Then ____he got was that he could use different shapes ____(represent) different objects. The ____(one) Chinese characters were drawings of physical objects. Some characters ____(simplify) and others have been made ____(difficult) over time.____, as a whole, the characters have ____(gradual) developed from drawings into standard forms.

题目：家乡的                              

仔细观察周围的景物，写一篇不少于500字的写景文章，要抓住特点，做具体描绘。

如：花圃  月夜  秋晨  河流  雪山

要求：①把题目补充完整写下来。②除诗歌外，文体不限。③书写工整，卷面整洁。

请将秦始皇在政治、经济、思想、文化和军事方面采取的主要措施及影响填写在表格中。