B．but解析：选A。考查连词辨析。句意为：我的心里充满了快乐因为我能够使那些工作了一天的路人露出微笑。根据语境可知此处表示因果关系。because意为“因为”符合语境。but意为“但是”；although意为if意为“如果”均与语境不符。故答案选A。记叙文(二)A

　　(2015·石家庄二模)Last year__1__，I stayed with her for a month.During that time，I helped her out with the housework and contributed to the __2__．__3__ the groceries were running out pretty quickly.__4__，I began observing my mother’s daily routine for two weeks.To my __5__，I found she would pack a paper bag full of canned goods and __6__ every morning at about nine.She took the food to the slums(贫民窟) and distributed it to street __7__．__8__ my mum was pupular in the area.The kids looked up to her as if she were their own mother.Then it hit me—why didn’t she want to tell me about what she’d been doing？Was she __9__ that I would stop buying the groceries if I knew the truth?__10__ she could react，I gave her a big hug and told her she didn’t need to keep it a __11__ from me.She told me that __12__ of the children lived with an old lady in a makeshift home while others __13__ on the streets.For years，my mum had been helping out by __14__ whatever food she could __15__.I was so moved by how __16__ she was.She used what was __17__ for her to help others in need.And I was so __18__ of her.

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