题目

下列关于合成材料的说法中，不正确的是（    ） A. 塑料、合成纤维和合成橡胶都属于合成材料 B. 聚氯乙烯可制成薄膜、软管等，其单体是CH2=CHCl C. 合成酚醛树脂的单体是苯酚和甲醇 D. 合成顺丁橡胶的单体是CH2=CH﹣CH=CH2 答案：C 【解析】 【详解】A.人造材料中，塑料、合成纤维和合成橡胶号称20世纪三大有机合成技术，则塑料、合成纤维和合成橡胶都属于合成材料，A正确； B.聚氯乙烯由氯乙烯加聚反应生成，则其单体是CH2=CHCl，可制成薄膜、软管等，B正确； C.合成酚醛树脂的单体是苯酚和甲醛，C错误； D.合成顺丁橡胶的单 三、 阅读理解（共20小题，满分40分） 第一节：阅读下列短文，从每题所给的四个选项（A, B, C, 和D）中，选出最佳选项，并在答题纸上将该选项标号涂黑。 As one approaches some crossroads, one comes to a sign which says that drivers have to stop when they come to the main road ahead. At other crossroads, drivers have to go slow, but they do not actually have to stop (unless, of course, there is something coming along the main road); and at still others, they do not have either to stop or to go slow, because they are themselves on the main road. Mr. Williams, who was always a very careful driver, was driving home from work one evening when he came to a crossroads. It had a “Slow” sign, so he slowed down when he came to the main road, looked both ways to see that nothing was coming, and then drove across without stopping completely. At once he heard a police whistle, so he pulled in to the side of the road and stopped. A policeman walked over to him with a notebook and pencil in his hand and said, “You didn’t stop at the crossing.” “But the sign there doesn’t say “Stop”,” answered Mr. Williams. “It just says “Slow”, and I did go slow.” The policeman looked around him, and a look of surprise came over his face. Then he put his notebook and pencil away, scratched his head and said, “Well, I’ll be blowed. I am in the wrong street!” 1. Which of the following statements is correct? ? A. Stop signs can be found at every crossroads. B. At crossroads with a “Slow” sign, drivers never have to stop. C. At crossroads with a “Slow” sign, drivers have to stop and then go slow. D. At some crossroads, drivers needn’t stop or go slow. 2. What do you think the policeman would do in the end? A. Fine Mr. Williams.                   B. Take him to the police station. C. Apologize to Mr. Williams.                  D. Give Mr. Williams his notebook and pencil. 3. Which might be the best title for this passage? A. Signs at the crossroads                 B. A careful driver C. A policeman and a driver               D. Policeman in the wrong street