下列物品所使用的主要材料为有机合成材料的是（  ）

如图，直线a，b被c所截，a∥b，若∠1＝35°，则∠2的大小为（    ）

阅读下面的古诗。
                                                                                                                                                  画眉鸟
                                                                                                                                                  欧阳修
                                                                                                                         百啭千声随意移，山花红紫树高低。
                                                                                                                         始知锁向金笼听，不及林间自在啼。