题目

If you spend some time in an English-speaking country you might hear the term “etiquette”. It means normal and polite social behavior. This may seem like a difficult word at first, but it can be very useful to understand.Etiquette is not the same in every culture or in every situation. For example, standing very close to the person you are talking with is quite common in some Asian countries. However, if you do this in Europe，some people might feel uncomfortable. Even in China，we all know that etiquette is not the same in all situations. Perhaps we think that talking loudly in our own 下列光现象中是由光的反射形成的是A. 雨后的彩虹B. 水中的倒影C. 海市蜃楼D. 透过树丛的光束