题目内容：
Directions：This part consists of a short passage．In this passage,there are altogether 10 mistakes,one in each numbered line. You may have to change a word,add a word or delete a word．Mark out the mistakes and put the corrections in the blank provided．If you change a word,cross it out and write the correct word in the corresponding blank．If you add a word,put aninsertion mark(∧)in the right place and write the missing word in the blank．If you delete a word,cross it out and put a slash(/)in the blank． Example：
Television is rapidly becoming the literature of our periods 1.time/times/period
Many of the arguments having used for the study of literature 2．_/_________
as a school subject are valid for∧study of television． 3． The_________
注意：此部分试题在答题卡2上；请在答题卡2上作答。
根据以上短文，回答题
请作答_________________
参考答案：
答案解析：