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问题 单项选择题

在下列各项税金中，应在利润表中的“主营业务税金及附加”项目反映的是 ()。

A．车船使用税

B．城市维护建设税

C．印花税

D．房产税

答案

参考答案：B

解析：车船使用税、印花税、房产税应在利润表中的“管理费用”项目反映。

完形填空
完形填空。
     There __1__ a nice girl in our middle school. She is in __2__. She is __3__years old.  She is not tall
and she is not short. She has a__4__ face like an apple. Her eyes are big, __5__ her mouth is small. Her
hair is short and  black.  She likes red. She is often __6__ red clothes.   Her  parents  are __7__doctors.
Her brother is Japanese teacher.  She loves her family and ___8__love her,  too.  She  likes little animals.
She has a little dog in her home. __9__ name is Xiaoxiao. __10__is she?
( )1. A. is     
( )2. A. row five
( )3. A. forty   
( )4. A. round   
( )5. A. with   
( )6. A. on     
( )7. A. a      
( )8. A. they   
( )9. A. It     
( )10.A. Who      		B. are     
B. five row
B. for     
B. big     
B. or     
B. in     
B. an     
B. them   
B. Its     
B. Who's 		C. has       
C. Row Five  
C. four     
C. small     
C. but       
C. under     
C. the      
C. their     
C. She       
C. Whose   		D. have          
D. Five Row      
D. fourteen      
D. long          
D. and            
D. put on        
D. /              
D. theirs        
D. He             
D. How          
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解答题
A、B两个投资项目的利润率分别为随机变量X1和X2，根据市场分析，X1和X2的分布列分别为
X1
5%
10%
P
0.8
0.2
 
X2
2%
8%
12%
P
0.2
0.5
0.3
(1)在A，B两个项目上各投资100万元，Y1和Y2分别表示投资项目A和B所获得的利润，求方差V(Y1)、V(Y2)；
(2)将x(0≤x≤100)万元投资A项目，100－x万元投资B项目，f(x)表示投资A项目所得利润的方差与投资B项目所得利润的方差的和．求f(x)的最小值，并指出x为何值时，f(x)取到最小值．
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