他的嘴角又浮起一丝微笑，那是因为他看见火车前进方向的右面，在一棵高大的白杨树身边，几棵小树正迎着风沙成长起来。   
1．“一棵高大的白杨树”暗指____       。“几棵小树”暗指                       。
2．爸爸的“微笑”表达了                                                                                                          
                                                                                                                                                   
3．这句话的意思是                                                                                                                      
                                                                                                                                                     

【考点】理解句子,现代文阅读

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