当事人取得权利必须支付相应代价的合同是( )。 A．支付合同 B．有偿合同 C．

Read and choose.(阅读短文，回答问题)  

     Mr Jones and Mr Brown worked in the same office. One day Mr Jones said to Mr Brown,

"I am going to have a small party at my home next Wednesday evening. Would you and your

wife like to join us?"

     Mr Brown said, "Thank you very much. It is very kind of you. We will be free that evening,

I think. But I will t.elephone my wife and ask her. Maybe she wants to go somewhere else that

evening." So Mr Brown went to the other room and telephoned.

     When he came back, he looked very sorry.

     "What is the matter?" said Mr Jones. "Did you speak to your wife?"

     "No," answered Mr Brown, "She wasn't there. My small son answered the telephone. I said

to him, 'Is your mother there, David?' And he answered, 'No, she is not in the house,' 'Where

is she  then?' I asked. ' She is somewhere outside.' 'What is she doing?'  'She is looking for me.'"

1. A small party will be held _____.      

A. at David's house                      

B. at Mr Brown's house

C. in the office                          

D. at Mr Jones' house

2. The small party will be held _____.       

A. next Wednesday even.ing                

B. next Monday evening

C. next Friday evening                    

D. next Wednesday morning

3. Mr Jones asked _____ to the party.       

A. Mr Brown                            

B. Mrs Brown

C. Mr and Mrs Brown                    

D. all his friends

4. The telephone was _____.                

A. in the same office                      

B. in a room next to the office

C. in the post office                      

D. near Mr Jones' house

5. Mr Brown spoke to _____ on the phone.       

A. Mrs Brown                          

B. Mrs Jones

C. David                                

D. David's friend

患者，男性，20岁，腕部皮肤感染脓肿形成，应选用（）。

A.红外线照射

B.局部冷敷

C.局部乙醇擦拭

D.局部放热水袋

E.局部热湿敷

ROC曲线能够反映出（）

A.信号的先定概率对报准率和虚报率的影响

B.同一观察者不同的感受性

C.信号检测标准变化时报准率和虚报率的变化

D.不同观察者的敏感性指标

下列有关骶管阻滞的叙述中，哪项错误（）

A.硬膜囊的尖端达第2～3骶孔的高度

B.骶管解剖变异较多，成人约占20%

C.骶管穿刺可出现负压

D.穿刺点可选两骶角连线的中点

E.是硬膜外阻滞的一种方法

抗高血压药根据作用部位不同，可将其分成哪些类？