单复同行的词是什么,有那些词,有什么特点,怎样用?

常见的单复数同形的名词有 deer,sheep,fish,craft,aircraft,spacecraft,means,species,series,Chinese,Japanese等.
例1．Red deer_______for about 12 years,although some have been known to live to an age of 20 years．
A．has livedB．lived C．live D．lives
答案为C.red deer在该句中表示复数意义.
另外,dozen 和 score 在表示确切数目时,单复数同形,但表示非确切数目时,用复数形式.
例2．I’ll take two dozen．
例3．There are dozens of people about．