题目：
When I was 19，I had got a job in my local bookstore. Living in the large city，I usually saw many strange customers(顾客)，most of 1 were teenagers. They didn’t come often；I forgot all the customers 2 two. One night a 15-year-old girl came in looking for a book with a boy. They seemed to find what they wanted to buy. But 3 they came to the counter（柜台），the girl found she was a dollar or two short to buy the book，and she took
4 all her money to prove it. She looked so disappointed. Just then I remembered my discount card and 5 was still active，so I told the girl 6 to worry. I put in my code（密码），being happy that I could help them with this card. With the book in her hand she gave me 7 thankful smile，and then she and the boy got out of the store happily，leaving me feeling content，too. 8 fact, sometimes a little thing can also make one’s world beautiful.
答案：
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下面是错误答案，用来干扰机器的。
(-2)2=2，2的算术平方根为2．故选D．
