下列哪几种药物常被用来增强吗啡止痛效果，降低药物副作用（） A.纳洛酮 B.丁丙诺啡

阅读理解。

     One day an old man is selling a big elephant. A young man comes to the elephant and begins to

look at it slowly. The old man goes up to him and says in his ear, " Don't say anything about the elephant

before I sell it. Then I will give you twenty dollars." "All right," says the young man. After the old man

sells the elephant, he gives the young man twenty dollars and says, " Now, can you tell me how you

found the elephant's bad ears?" " I didn't find the bad ears," says the young man. " Then why are you

looking at the elephant slowly?" asks the old man. The young man answers, "Because I have never

seen an elephant before, and I want to know what it looks like."

1. ______ the elephant.

A. The young man sells      

B. The old man sells

C. The two men sell        

D. The old man buys

2. The young man is looking at the elephant slowly. He wants to find out _______.

A. which foot of the elephant is bad    

B. how heavy it is

C. which ear of the elephant is bad    

D. what it looks like

3. The young man _______.

A. knows the elephant has bad ears  

B. wants to buy the elephant

C. looks after the elephant    

D. gets some money from the old man

4. The young man _______.

A. is not interested in elephants

B. knows what an elephant looks like

C. has seen some elephants before

D. has never seen an elephant before

5. Hearing what the young man said, the old man will probably (可能) be ______.

A. angry      

B. happy      

C. dangerous    

D. hungry

下列有关时效制度的说法正确的有：（）

A.时效制度是指行政机关必须在法定的期限内作出行政行为，否则应承担相应的法律责任

B.行政行为的时效一般由法律明确规定，有些情况下也可以由行政机关根据具体情况指定

C.时效制度不仅有助于提高行政效率，也有利于保障相对人的合法权益

D.行政机关如果超过法定期限作出行政行为，该行政行为就构成违法，应承担相应的法律后果

男性，43岁。活动后胸痛3年，曾诊为肥厚型心肌病，要求明确诊断。

肥厚型梗阻性心肌病诊断最有意义的是（）

A.IVS：左室后壁≥1.5：1，二尖瓣前叶收缩期向前移动

B.胸骨左缘3～4肋间有响亮的收缩期杂音

C.站立后易晕厥

D.用力后心前区闷痛

E.左室流出道存在压力阶差

在文本框中输入密码时，要求在文本框中只显示(*)号，则应当设置此文本框的( )属性。

A．Text

B．Caption

C．Password

D．PasswordChar

淋巴细胞减低见于（）。

A.风疹

B.严重化脓性感染

C.组织移植排斥反应

D.白血病

E.再生障碍性贫血