当消费者的欲望得到（）的支持后，其欲望就转变为需求。 A.需要 B.产品 C.购买力

关于肝素的主要抗凝机制正确的是（）

A.增强抗凝血酶Ⅲ与凝血酶的亲和力

B.抑制凝血酶原激活

C.促进纤维蛋白吸附凝血酶

D.抑制因子X的激活

E.使血浆中的Ca²⁺成为不解离的络合物

阅读理解

     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.

1. 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.

2. 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.

3. 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.

4. 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.

5. 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

简述促进知识保持的主要方法

对于循环润滑，油箱液位应保持在（）以上

A.1/3

B.1/2

C.2/3

患者张某，女性，23岁。2日前不慎感寒后出现喘逆上气，胸胀而痛。鼻煽，咳吐黄稠痰。恶寒无汗，身痛口渴，苔黄质红，脉浮数。

治法宜用（）

A.宣肺散寒

B.宣肺泻热

C.疏风解表

D.清肺化痰

E.清热化痰