阅读下面材料，根据其内容和所给段落开头语续写阿段，使之构成一篇完整的短文。
At first glance she looked like any other old woman, plodding along in the snow , alone, neglected, head bowed. A young couple, smiling, taking, laughing, arms loaded with Christmas presents, took no notice of the old woman. A mother with two small children hurried by, on their way to grandmother's house. Like many others, they took no notice, either. If these people had noticed, they would have seen that the old woman wore no shoes. She walked bare foot in the ice and snow.
With both hands the old woman gathered her worn button-less overcoat at the collar to keep out the wind. She stopped and stood bent and bowed at the bus stop. A red and blue scarf covering her head, she waited for the downtown bus.
A gentleman carrying an Important looking briefcase waited near her, not too closely. After all, she could have something contagious (传染的）. A teenage girl also waited for the bus, She glanced repeatedly at the old woman's feet, but said nothing.
The bus arrived and the old woman slowly, painfully boarded. She sat on the sideways sent Just behind the driver. The gentleman and the teenage girl hurried to the back of the bus. A little boy pointed at the old woman," Look, Mother, that old lady is bare foot. "The embarrassed mother slapped his hand down. "Don't point at people, Andrew. I's not polite to point." She looked out of the window.
＂She must have sons or daughters," a lady in a fur coat suggested, "her children should be ashamed of themselves." She felt morally superior, because she took good care of her mother.
A man seated near the middle of the bus steadied the bag of gifts on her lap. "Don't we pay enough taxes to handle situations like this?" he said to a friend seated beside him.
"People have to learn to save their money," a well-dressed young college man added. "If that old woman had saved when she was young, she wouldn't be suffering now. It's her own fault."
And all these vain(虚荣
）people beamed with satisfaction that they had all given such deep analysis,totally ignoring the old woman who badly needed a pair of shoes immediately.
注意：续写词数应为150左右
A vain businessman felt offended by those talking without acting and reached into his wallet.
At the next stop.a young man wearing expensive.new.brand-name shoes boarded the bus,
). However, "transparent" does not necessarily mean that all light can pass through it. Some obsidian (黑曜石) glasses are so darkly colored that they are effectively black and opaque (不透光的). This is because electrons of some elements in the obsidian are arranged in such a way that