蛋白质发生热变性的原因是破坏了（　　）

阅读诗歌，回答问题。

                                                                                                            望    岳
                                                                                                              杜甫
                                                                                            岱宗夫如何？齐鲁青末了。
                                                                                            造化钟神秀，阴阳割昏晓。
                                                                                            荡胸生曾云，决眦入归鸟。
                                                                                            会当凌绝顶，一览众山小。

The rain stopped ten minutes _____.

方程的根是（   ）