问题
选择题
分子式C4H8O2的有机物与稀硫酸溶液共热可得有机物A和B.将A氧化最终可得C，且B和C为同系物。若C可发生银镜反应，则原有机物的结构简式为 （ ） A．HCOOCH2CH2CH3 B．CH3COOCH2CH3 C．CH3CH2COOCH3 D．HCOOCH（CH3）2 |
答案
答案：D
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分子式C4H8O2的有机物与稀硫酸溶液共热可得有机物A和B.将A氧化最终可得C，且B和C为同系物。若C可发生银镜反应，则原有机物的结构简式为 （ ） A．HCOOCH2CH2CH3 B．CH3COOCH2CH3 C．CH3CH2COOCH3 D．HCOOCH（CH3）2 |
答案：D
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| Some people were eating and drinking in a coffee shop. A young woman was sitting alone at a table. She was 1 a beautiful diamond necklace. There was an ugly man at a table not far 2 her. He was looking at her necklace all the time. Suddenly the lights went 3 . The coffee house was in the dark. The woman started to 4 . She was very 5 . A few minutes later, the lights came on again. The woman was crying. Her necklace was 6 . The manager quickly 7 all the doors. He telephoned the police. 8 could get out of the coffee house. The policemen soon came. The police officer 9 his men to search everyone.The necklace was not on 10 . They then searched the whole coffee house. They could 11 nothing. The police officer 12 the faces of all the people in the coffee house. He saw the ugly man and looked at the man carefully. He went up to the man and picked 13 the bowl of soup 14 was on the table. He then poured the soup into the glass. The necklace fell out. The policemen caught the man and 15 him away. The young woman was happy to get back her necklace. |
| ( )1. A．wearing ( )2. A．by ( )3. A．down ( )4. A．cry ( )5. A．happy ( )6. A．miss ( )7. A．opened ( )8. A．No one ( )9. A．decided ( )10. A．everyone ( )11. A．look for ( )12. A．watched ( )13. A．on ( )14. A．there ( )15. A．carried | B．dressing B．to B．out B．laugh B．exciting B．gone B．had opened B．Anyone B．hoped B．anyone B．see B．saw B．out B．that B．brought | C．putting on C．beside C．away C．shout C．afraid C．lose C．closed C．Someone C．let C．someone C．find C．looked around C．up C．it C．got | D．having on D．from D．up D．sing D．sad D．losing D．had closed D．Everyone D．asked D．the ugly man D．find out D．looked D．over D．/ D．took |