What does “a greenhorn” mean?

What does “a greenhorn” mean?
【正确答案】：A greenhorn refers to a raw, simple and inexperienced person, easily fooled or parted from his money. Do you see anything green in my eye means “Do you think that I’m so inexperienced that you can fool me?”
【题目解析】：参见教材P238。
掌握“Terms of colour”知识点。