阅读王维的《使至塞上》。
                                                                                                   使至塞上
                                                                                                      王维
                                                                                        单车欲问边，属国过居延。
                                                                                        征蓬出汉塞，归雁入胡天。
                                                                                        大漠孤烟直，长河落日圆。
                                                                                        萧关逢侯骑，都护在燕然。