维生素B1的分子结构中不含有（） A.嘧啶环 B.噻唑环 C.硫基 D.氢基 E.羧

“哲学如同阳光，有了哲学，明明亮亮，能视通万里看得远；掌握哲学，穿云破雾，能思接千载想得深”这段话说明： [ ]

A．哲学是科学之科学

B．哲学可以为人们的实践活动提供现成的方案

C．学习哲学，人们认识世界和改造世界的活动一定成功

D．科学的哲学对人们的实践活动有积极作用

实验室中，利用下列装置可以制取某些气体，请回答下列问题。

（1）（2分）写出图中标号仪器的名称：①_______________ ②__________________

（2）用大理石和稀盐酸反应制取CO₂，应选用的发生装置是（填代号，下同）______，最好选用的收集装置是___   _；反应的化学方程式：                                              。

（3）加热固体碳酸氢钠或固体碳酸氢铵都能产生CO₂其化学方程式分别是：

①2NaHCO₃Na₂CO₃+H₂O+CO₂↑ ②NH₄HCO₃NH₃↑+H₂O+CO₂↑

某同学采用反应①的方法制取CO₂，应该选用的发生装置是_____________，他不选择反应②制取CO₂的理由是______________________________________________。

（4）实验室利用硫化亚铁（FeS）和稀盐酸反应来制取硫化氢（H₂S）气体，硫化氢是一种能溶于水，密度比空气大的有毒气体，该发生反应的化学方程式为                      ，所用制硫化氢的发生装置为         ，收集装置为          。

Lisa was running late. Lisa，25，had a lot to do at work，plus visitors on the way: her parents were coming in for Thanksgiving from her hometown. But as she hurried down the subway stairs，she started to feel uncomfortably warn. By the time she got to the platform，Lisa felt weak and tired--maybe it hadn’t been a good idea to give blood the night before，she thought. She rested herself against a post close to the tracks.

Several yards away，Frank，43，and his girlfriend，Jennifer，found a spot close to where the front of the train would stop. They were deep in discussion about a house they were thinking of buying.

But when he heard the scream，followed by someone yelling，“Oh，my God，she fell in!” Frank didn’t hesitate. He jumped down to the tracks and ran some 40 feet toward the body lying on the rails. “No! Not you! ”his girlfriend screamed after him.

She was right to be alarmed. By the time Frank reached Lisa，he could feel the tracks shaking and see the light coming. The train was about 20 seconds from the station.

It was hard to lift her. She was just out. But he managed to raise her the four feet to the platform so that bystanders could hold her by the grins and drag her away from the edge. That was where Lisa briefly regained consciousness，felt herself being pulled along the ground，and saw someone else holding her purse.

Lisa thought she’d been robbed. A woman held her hand and a man gave his shirt to help stop the blood pouring from her head. And she tried to talk but she couldn’t，and that was when she realized how much pain she was in.

Police and fire officials soon arrived，and Frank told the story to an officer. Jennifer said her boyfriend was calm on their 40-minute train ride downtown—just as he had been seconds after the rescue，which made her think about her reaction at the time. “I saw the train coming and 1 was thinking he was going to die，”she explained.

41. What was the most probable cause for Lisa’s weakness?

A. She had run a long way.

B. She felt hot in the subway.

C. She had done a 1ot of work.

D. She had donated blood the night before.

42. Why did Jennifer try to stop her boyfriend?

A. Because they would miss their train.

B. Because he didn’t see the train coming.

C. Because she was sure Lisa was hard to lift.

D. Because she was afraid the train would kill him.

43. How did Frank save Lisa?

A. By lifting her to the platform.

B. By helping her rise to her feet.

C. By pulling her along the ground.

D. By dragging her away from the edge.

44. When did Lisa become conscious again?

A. When the train was leaving.

B. After she was back on the platform.

C. After the police and fire officials came.

D. When a man was cleaning the blood from her head.

45. The passage is intended to _____________

A. warn us of the danger in the subway

B. show US how to save people in the subway

C. tell US about a subway rescue

D. report a traffic accident

( )是一个国家的基本通货和法定的计价结算货币。

A．本位货币
B．基础货币
C．现金货币
D．高能货币

一患者左下第一磨牙大面积银汞合金充填，近中食物嵌塞，要求修复。

患者食物嵌塞的可能原因不包括

A．与邻牙接触不良

B．平面与邻牙不一致

C．龈 * * 萎缩

D．银汞充填体边缘微漏

E．银汞充填物有悬突