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问题 单项选择题

实体是信息世界中广泛使用的一个术语，它用于表示

A．有生命的事物

B．无生命的事物

C．实际存在的事物

D．一切事物

答案

参考答案：C

解析：【解析】实体是客观存在且可以相互区别的事物。实体可以是具体的对象，如一个学生，也可以是一个抽象的事件，如一次出门旅游等。因此，实体既可以是有生命的事物，也可以是无生命的事物，但它必须是客观存在的，而且可以相互区别。

完形填空
完形填空。
     I have a good friend. His name is John. He is fourteen years old. He     1     from America. His father
is an     2     , too. His mother is from Canada. But they are in China     3    .  John's father works in a
hospital     4     a doctor.     5     his  mother works in a hospital too. But she is not a doctor. She wears a
white uniform and     6     doctors. Sometimes she works     7     the day and sometimes     8     night.
John wants to     9     a reporter. He likes talking to people and he often writes stories. They all like
China. They    10     Chinese are very friendly and intelligent.
( )1. A be              
( )2. A Canadian        
( )3. A the              
( )4. A. for            
( )5. A. And            
( )6. A. to help        
( )7. A in              
( )8. A in              
( )9. A like            
( )10. A. tell           		B. are              
B. Canada          
B. sometimes        
B. with            
B. Or              
B. help            
B. on              
B. on              
B. as              
B. talk             		C. comes            
C. American        
C. last year        
C. of              
C. But              
C. helps            
C. at              
C. at              
C. be              
C. speak        		D. come              
D. America          
D. now              
D. as                
D. Then              
D. helping          
D. for              
D. during the day    
D. am                
D. say     
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单项选择题

八大行星中，最靠近太阳的行星是（）

A.水星

B.火星

C.金星

D.地球
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