题目

阅读下面短文，从短文后各题所给的四个选项（A、B、C 和 D）中，选出可以填入空白处的最佳选项。 My class and I visited Chris Care Center in Phoenix, Arizona to comfort the old people. The first two 1 there were for persons requiring 2 in taking care of themselves. They loved our sweet songs we sang and the flowers we gave them. As we were 3 on the third floor for old people with Alzheimer (老年痴呆症), most of them 4 off at the walls or floor. However, one lady 5my eye. She was singing songs to herself. They weren't the songs that we were singing, at l小数点右边是(　　)部分，十分位的计数单位是(　　)．