3．A　解析：推理判断题。根据最后一段Cristina Kirchner的话“made all Argentines proud”可推知，她对这个研究感到非常满意。故选A项。

　　Ⅱ.完形填空

　　Many years ago，I was a struggling single mom starting up a new business.It was the __1__ season，and my boyfriend and I had decided that we would splurge(挥霍)for just one evening，and go out to __2__.We went to the Red Lobster and it got me thinking about my college __3__ days and how much I enjoyed working during that time：people shopping，feeling __4__ and tipping big.I was in the holiday__5__ and wanted to give the waitress a big tip，__6__　I knew it wasn't going to be a big Christmas for us that year.

　　When we had picked what we wanted，I did a quick __7__ in my head to make sure that I had enough　money before　we __8__ the order.At the end of the meal，when we asked for the __9__，the waitress replied，“It's already taken care of.” I didn't __10__.She clarified(阐明)and told us that someone had __11__ our dinner！We looked all around trying to find the __12__ of someone we knew but we didn't recognize anyone.I was __13__！How did someone pay this off without __14__ knowing it...and why us?

　　I was so touched！That was 12 years ago，__15__ I will never forget how that made us __16__.I have always tried to“pay­it­forward”，but I don't think that person could have __17__ understood how much their random act of __18__ meant to me.I will never forget it.Anytime I __19__ someone who is rude or mean，I just have to think of that story and __20__ how loving and giving the human spirit really is.

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