根据所掌握的文化或背景知识，选择正确答案。

1. Australia is a big country. Australians speak  ______. 

A. French  

B. Chinese  

C. English  

D. Japanese

2. ______only in China , they look pretty cute and have two big black eyes.    

A. giraffes      

B. Lions      

C. Koalas    

D. Pandas

3. ______ wear white uniforms and help doctors in hospital.    

A. Bank clerk    

B. Doctors  

C. Nurses  

D. shop assistant

4. In a ______ ,we can read many kinds of books ,but you must keep quiet there. 

A. pay phone  

B. restaurant  

C. post office        

D. library

5. Where is New York ? It's in______.    

A. the United Kingdom

B. the United States  

C. France  

D. Canada

6. In Africa , the weather there is often______.     

A. cold  

B. windy

C. snowy  

D. hot

男性，25岁，近3年来常有胸痛、发作性晕厥，心脏听诊胸骨左缘3、4肋间有收缩期杂音，心脏轻度增大，心电图见Ⅱ、Ⅲ、aVF有病理性Q波。

肥厚型梗阻性心肌病应选用下列何种药物最适宜（）

A.洋地黄

B.多巴酚丁胺

C.硝酸盐类

D.普罗帕酮

E.钙拮抗剂