图中几条直线、几条射线、几条线段？（四年级上册数学问题）

数线的问题，比较繁琐，可以采取有序思考的方法，逐一解决。

数直线时，根据直线特征：没有端点，向两端无限延长。

数射线时，根据射线特征：只有一个端点，向另一端无限延长。

数线段时，根据线线特征：有两个端点，有限长。

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