题目

下列实验方案设计合理且能达到实验目的的是 A. 检验乙炔发生加成反应：将电石制得的气体直接通入溴水，溴水褪色 B. 提纯含少量苯酚的苯：加入氢氧化钠溶液，振荡后静置分液，并除去有机相的水 C. 制备少量乙酸乙酯：向乙醇中缓慢加入浓硫酸和冰醋酸，用NaOH溶液吸收乙酸乙酯，除去乙醇和乙酸 D. 验证有机物X是否含有醛基：向1 mL 1％的NaOH溶液中加入2 mL 2%的CuSO4溶液，振荡后再加入0.5 mL有机物X，加热煮沸 完形填空先通读短文，掌握其大意，然后从A、B、C、D四个选项中选出一个可以填入相应空白处的最佳答案，并将其标号填入题前括号内。Paul received an expensive car from his brother as a Christmas present．On Christmas Eve Paul saw a dirty and poorly-dressed boy walking 1 his shining car．“Is this your car，Paul？”he asked．Paul told him how he got the car and the boy was 2_ ．“You mean your brother gave it to you and it didn’t cost you nothing？Boy，I wish…” he said, without 3 his sentence．Paul thought the boy wished he had a 4_ like that. But what the boy said surprised Paul greatly. “I wish,”the boy went on，“that I could be a brother like that．”Paul looked at the boy in surprise. He invited him to take a 5 in his car and the boy agreed happily. After a short ride，the boy turned and with his eyes 6_ ，said，“Paul，would you mind driving in front of my house？” Paul smiled a little．He thought the boy wanted to 7_ his neighbors that he could ride home in a big car. But Paul was wrong 8_ . The boy ran back into his house, and after a short while came back with his disabled brother in his arms. He 9_ him down on the step and pointed to the car. “There she is, Buddy, just like what I told you upstairs. His brother gave it to him for Christmas and it didn’t 10_ him a cent. Some day I’m going to give you one just like it.”( )1. A. inside B. around C. through D. across( )2. A. interested B. excited C. satisfied D. surprised( )3. A. finishing B. understanding C. hearing D. checking( )4. A. car B. brother C. sister D. family( )5. A. seat B. rest C. ride D. picture( )6. A. watering B. shining C. wondering D. shaking( )7. A. frustrate B. shock C. remind D. show( )8. A. either B. too C. again D. instead( )9. A. sat B. dropped C. let D. kept( )10. A. pay B. cost C. bring D. return