1.我们应该尽一切努力保护环境。We should do____ ____ ____ to protect the environment.2.我希望他会意识到他的错误。I hope that he will_____________ his mistakes.3.她肯定拿工厂的噪声使她夜间无法入睡。She was sure that the noise from the factory would ___ her ____ at night.各位在线老师 ...

九年级教材中有许多不错的段落、文章，但又没时间把所有的课文都背诵一遍。请问，有哪些课文是值得背诵的？谢谢！:D :'( :lol :loveliness:

(1-m^2-n^2)(m^2 n^2)=-6，求m^2+n^2