下列自然现象与太阳辐射无关的是（    ）

                                                                                                                     钱塘湖春行
                                                                                                                      唐 白居易
                                                                                                     孤山寺北贾亭西，水面初平云脚低。
                                                                                                    几处早莺争暖树，谁家新燕啄春泥。
                                                                                                    乱花渐欲迷人眼，浅草才能没马蹄。
                                                                                                    最爱湖东行不足，绿杨阴里白沙堤。