Which of the following words is

Which of the following words is NOT morphologically motivated?
A、airmail
B、hopeless
C、reading-lamp
D、greenhorn
【正确答案】：D
【题目解析】：本题考查的是形态理据的范例，形态理据构成的词有合成词和派生词，还有一个特点是通过构词成分可以推断出词义，这里只有D选项不是指绿色的号角。