题目

It was an extremely hot spring day. A thunderstorm had passed over and now the clouds were _______ and the sun had returned. Steam was coming off the _______ sidewalks as I parked my car. I _______ into the local store to buy my son a shirt. The air conditioning there was a good relief from the _______ outside.Having made my _______, I walked back into the heat. I got into my car but had to wait to _______ because all the cars lined up at the _______ stop light. I looked out of my car _______ and saw something on the pavement. A single butterfly was desperately fluttering(拍打) its wings but用显微镜观察人血涂片时，在同一个视野中所见到数量最多的细胞是（　　）A.血小板B.红细胞C.淋巴细胞D.白细胞