A person’s nose is important for breathing and smelling. Some people are able to “lead other people by the nose”. For example, if a wife “leads her husband by the nose”, she makes him do whatever she wants him to do.They will not change their opinions or positions on anything. If someone is “hard-nosed”, chances are that he will never “pay through the nose”, or pay too much money for an object or service.
It is always helpful when people “keep their nose out of other people's business”. They do not interfere(干涉). The opposite of this is someone who “noses around” all the time.  He is considered “nosey”. Someone who “keeps his nose to the grindstone(旋转磨石)” works very hard. This can help a worker “keep his nose clean” or stay out of trouble.
One unusual expression is “that is no skin off my nose”. This means that a situation does not affect or concern me. We also say that sometimes a person “cuts off his nose to spite his face”. That is, he makes a situation worse for himself by doing something foolish because he is angry. More problems can develop if a person “looks down his nose” at someone or something.  This person might also “turn up his nose” at something that he considers not good enough. This person thinks he is better than everyone else. He “has his nose in the air”.
 They refuse to obey orders or do any work. Maybe these students do not know the correct answers. My mother always told me, if you study hard, the answers should be “right under your nose” or easily seen.

A．This kind of person is interested in other people's private matters.

B．In school, some students “thumb their nose” at their teacher.

C．The nose also has a lot of other functions.

D．Some people are said to be “hard-nosed”.

E. The nose is also used in many popular expressions.
F. He is interested in things that concern his work.
G. The person acts like something is unimportant or worthless.