问题 选择题
下列方程①3x2-x=0;②
x
+x2=1
;③3x+
1
x
=0
;④2x2-1=(x-1)(x-2);⑤(5x-2)(3x-7)=15x2,其中一元二次方程有(  )
A.1个B.2个C.3个D.4个
答案

①符合一元二次方程的条件,故正确;

②是无理方程,故错误;

③是分式方程,故错误;

④可化为x2+3x-3=0,符合一元二次方程的条件,故正确;

⑤可化为-41x+14=0,含一个未知数,是一元一次方程,故错误;

故是一元二次方程的只有①④.

故选B.

完形填空
完形填空。

Black: Is that Jim Green?
Green: Yes,1____________ Jim Green speaking.2____________ that?
Black: This is Bill Black 3____________.
Green: Hello, Bill. 4____________?
Black: I'm very well, thank you. 5____________?
Green: Fine, thanks.
Black: Can I come 6____________ see you this afternoon or this evening?
Green: 7____________. Come to my hotel (旅馆) 8____________.
Black: That's the Jinling Hotel.
Green: Yes, I'm 9____________ Room 606.
Black: Jinling Hotel, Room 606. Fine. Can I 10____________ at seven o'clock?
Green: All right. I'Il see you at seven. Goodbye.
Black: Goodbye.

( ) 1. A. I am    
( ) 2. A. Who's     
( ) 3. A. where       
( ) 4. A. Who are you 
( ) 5. A. Are you      
( ) 6. A. but       
( ) 7. A. All right   
( ) 8. A. that evening
( ) 9. A. at   
( ) 10. A. ask        
B. here is     
B. What's     
B. there      
B. How are you
B. But you     
B. and        
B. That's all  
B. in evening 
B. on         
B. come       
C. this is      
C. Where's      
C. here         
C. Nice to meet you
C. See you          
C. in              
C. Oh              
C. this evening    
C. behind          
C. go              
D. that is    
D. How's      
D. over there  
D. How do you do
D. And you    
D. or      
D. No       
D. at evening  
D. in        
D. look                  
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