缩句。     
1．小艇穿过一座座形式不同的石桥。  
                                                                                         
2．船夫的驾驶技术特别好。 
                                                                                          
3．簇拥在一起的小艇一会儿就散开了。
                                                                                            
4．青年妇女在小艇里高声谈笑。