题目

下列实验仪器中，主要制作材料属于有机合成材料的是（ ） A．烧杯 B．塑料水槽 C．蒸发皿   D．铁架台 答案：【考点】I7：合成材料的使用及其对人和环境的影响． 【分析】有机合成材料简称合成材料，要判断是否属于合成材料，可抓住三个特征：有机物、合成、高分子化合物，据此常见材料的分类进行分析判断． 【解答】解：A、烧杯是用玻璃制成的，玻璃主要成分是硅酸盐，属于无机非金属材料，故选项完形填空Once a man and his wife worked for an old man. There was a big box in the old man’s living room. The old man pointed（指着）to the box and said, “There’s only one thing you do. Don’t open the box.” saying this, he left his home.The woman said to her husband, “There must be expensive in the box. Let’s open it, shall we?” Her husband said to her. But the woman didn’t give up her . One day, she decided to find out was in it. Her husband didn’t stop her. She opened the box and looked inside. To her surprise, she found nothing in the box. She tried hard to close it, but she .That evening the old man came home and found the box was . He was very and asked the woman and her husband to leave his home.“But there was nothing in the box,” the woman said, “We didn’t take anything at all.” The old man them, “The box is not important, but I cannot believe you. That is important.”【1】A. may not B. mustn’t C. could not D. needn’t【2】A. After B. For C. By D. Before【3】A. nothing B. everything C. something D. anything【4】A. no B. yes C. goodbye D. much【5】A. work B. box C. way D. idea【6】A.which B. what C. who D. that【7】A. did B. opened C. failed D. stopped【8】A. lost B. open C. empty D. broke【9】A. general B. happy C. careful D. angry【10】A. turned to B. listened to C. shouted at D. smiled at