方程${\left(x-1\right)}^2=x-1$的根是（   ）

函数$y=\sin \left(\omega x+\phi \right)+1$的一段图象如图所示，则它的一个周期T、初相$\phi$依次为（  ）

森林火灾时常砍伐出一条隔离带，这样做依据的灭火原理是____ ，为节约能源，使燃料充分燃烧，应考虑的因素是____ （写出一条即可）．

阅读理解。

 Dear Mum,

    Thanks for the new dress. It's so nice! It's hot in Wuhan. I wear the dress to school. I am very happy. Miss Li says I can go back home after Friday. I want to buy a pair of sunglasses.They'reninety-one yuan. Thet're too expensive.

                                                                                                                                                                                              Love,Mary