用关联词语把句子连成一句话。   
1．威尼斯是世界闻名的水上城市，河道纵横交叉。  
     小艇成了威尼斯主要的交通工具，等于大街上的汽车。 
                                                                                                                                                    
                                                                                                                                                    
2．秦王不敢进攻赵国。赵国武有廉颇，文有蔺相如。 
                                                                                                                                                    
3．非洲植物世界是彩色的。非洲动物世界也是彩色的。