阅读材料回答问题
    某校初三年级16岁的小黄同学背着家长和老师去“泡网吧”，在网吧里交上了几个不三不四的朋友。他们学着“桃园结义”故事中的做法，以“哥们儿‘相称，搞什么“有福同享，有难同当”。一次，他们中的一个“兄弟”在斗殴中被人打伤，小黄就纠集了一伙人去“报仇”。小黄在斗殴中持刀将对方砍成重伤。结果他被法院判处了有期徒刑。铁窗中的小黄悔恨的说“都是哥们儿义气害了我......”

△ABC为锐角三角形，若角$\theta$终边上一点P的坐标为$\left(\sin A-\cos B,\cos A-\sin C\right)$，则$y=\frac{\sin \theta }{\left|\sin \theta \right|}+\frac{\left|\cos \theta \right|}{\cos \theta }+\frac{\tan \theta }{\left|\tan \theta \right|}$的值是（ ）

    What do you read when you travelling by train? What about other passengers? Perhaps a woman____(sit) near you is reading a romantic novel. A man is reading a serious biography about a politician. And there's a student reading an English textbook.

    What do their____(choice) say about them? Do you judge them by____they reading? I have to tell you that your impressions of them may be____(complete) wrong. The woman reading the romantic novel could be a ____(law). She just wants a light read to take her mind off work. The man reading the biography wants you____(consider) him knowledgeable, and he is just ____(show)off. The student reading the textbook isn't a student at all. She's an English teacher.

    Publishers know people are ____ (concern)about what they read on public transport and put out different versions (版本) of a cover For example, books about Harry Potter have an____ (interest)cover for young readers and then another more serious version for adults.

    So next time you see what other people are reading on a train don't jump to any conclusions.

    Here is a situation ____ you could say, "Don't judge a book by its cover.”