题目

My class and I visited Chris Care Center in Phoenix, Arizona to comfort the old people who needed a little cheering up during the holiday season. The first two __21__ there were for persons requiring help in taking care of themselves. We sang __22__ for them. They loved our sweet songs and the flowers that we left with them. As we were __23__ on the third floor for old people with Alzheimer (老年痴呆症), most of them __24__ off at the walls or floor. However, one lady __25__ my eye. She was sitting by the door, in a wheelchair, singing songs to herself. They weren’t the songs t2．春分（3月21日）昼夜长短情况是（　　）A．北半球昼长夜短B．南半球昼长夜短C．全球昼夜平分D．北半球昼短夜长