谁能回答,what is the difference between fixed costs and constant costs?不是翻译,是个问题.谢谢.

回答一个英语任务型阅读问题.What dose the writer worry a little about?“Cool”is a word with many meanings．Its old meaning is used to express a temperature that is a little bit cold．As the world has changed,the word has had many dif 英语作文：If it is the end of the world,what will you dIf it is the end of the world what will you do on your last day? 谁能回答,what is the difference between fixed costs and constant costs?不是翻译,是个问题.谢谢. What is skimming and What is scanning?0.0..谁能回答呀! what is the weather like?怎么回答 what is the young man,怎么回答 what is the time怎么回答? what color is the quilt 怎么回答 怎么回答what colour is the apple What is the passage about?怎样回答 what is the time 怎么回答? what shape is the ball (怎么回答) What is the Matrix?该怎么回答 what is the bird doing?怎么回答? what color is the tree 怎么回答? what colour is the bird 怎么回答 What is the weather like?雨天回答！ What+is+on+the+farm怎样回答