“它解释了微观世界的特殊的运动规律，有力地冲击了经典物理理论，……为现代自然科学知识和现代技术革命提供了重要的理论基础。”材料中的“它”（    ）

72－18=____

60－24=____

87－35=____

64＋36=____

已知m，n是一元二次方程x²-4x-3=0的两个实数根，则$\left(m-2\right)\left(n-2\right)$为（    ）．

阅读下面诗歌，回答（1）～（4）题。

麂子

牛汉

                                                                                                                       远远的

                                                                                                                       远远的

                                                                                                                       一只棕红色的麂子

                                                                                                                       在望不到边的

                                                                                                                       金黄的麦海里

                                                                                                                       一蹿一蹿地似飞似飘

                                                                                                                       朝这里奔跑

                                                                                                                       四面八方的人

                                                                                                                       都看见了你

                                                                                                                       用惊喜的目光

                                                                                                                       用赞叹的目光

                                                                                                                       用担忧的目光

                                                                                                                       麂子

                                                                                                                       远方来的麂子

                                                                                                                       你为什么生得这么灵巧美丽

                                                                                                                       你为什么这么天真无邪

                                                                                                                       你为什么莽撞地离开高高的山林

                                                                                                                        五六个猎人

                                                                                                                        正伏在草丛里

                                                                                                                        正伏在山丘上

                                                                                                                        枪口全对着你

                                                                                                                        哦，麂子

                                                                                                                        不要朝这里奔跑