通读下面短文，掌握其大意，然后在各题所给的四个选项中选出一个最佳答案。
A secret Santa brought an early Christmas gift to cash-strapped(囊中羞涩的) shoppers.
After overhearing 1 shopper say she may not be able to afford her outstanding(未付的) bill, Mr Parady walked over to the layaway(分期预付) department to see 2 he could do to help.
He paid the bills of six shoppers who were in the store at the time, 3 paying off half of every bill over $200.
Staff at the store 4 how the holiday hero swiped his card for customers who came up to the till (收银台) to cancel their orders, simply saying "5" afterwards.
"They didn't know what was happening 6," said Wal-Mart operations manager Deb Davis, "This one girl in particular, she goes, 'What do I owe?' My workmate goes, 'That gentlemen right there just paid for you.'''
7, the woman, began to cry and had to sit down on a bench.
The man used three different cards, took up two cashiers, and also made payments over the phone during the hours-long spree(狂欢) which employees described as 8 they had ever seen.
"I didn't intend for the attention but I hope it 9 other people." he said.
"I hope everyone will use it as a tool to give in their own way. It doesn't have to be 10, it can be time, or just something kind."
的方程
有一个根为
，则△ABC中一