一、阅读下面的材料 ,根据要求作文。在一次鼓励创新的报告会上 ,有位学者出了一道题 :四个图形符号中 ,哪一个与其他三个类型不同 ?有人说圆形 ,因为圆形是惟一没有角的图形 ;也有人说三角形 ,它是惟一由直线构成的 ;又有人说半圆形也正确 ,它是惟一由直线和曲线组成的 ;最后 First, read the following materials and compose the composition according to your requirements. At a report session that encouraged innovation, one scholar asked the question: Which of the four graphic symbols is different from the other three types? Some people say that the circle is the only one with no corners; others say The triangle is the only one made up of straight lines, and some people say that the semicircle is also correct. It is the only one composed of straight lines and curves;