20.（6分）

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19.（4分）                                                            

18.                                                                 

                        （4分）

17.（6分）                                                

六．（14分）

16.(4分)                                                    

15.（4分）(1)                                                 

(2)                                                          

14.（8分）(1)                                               

(2)                                                         

13.(6分)

（1）                                                    

（2）                                                    

（3）                                                   

(4)                                                    

五（22分）

12.(8分)

（1）                                                        

（2）                                                         

11.（10分）（1）                                               

 （2）