进行有性生殖的高等动物的生殖和发育如图所示，图中①、②和③过程分裂表示（）

    A 12-year-old boy got lost on the subway after going out alone on Sunday. The boy came to Shanghai to visit his parents during the summer holiday. Although his parents were happy to see him, they ____ little time with him. The boy did his homework for two ____ and felt bored, so he went out to play on the subway. He had fun playing there. But when he felt tired and hungry, and wanted to go home, he didn't know at which station he should get off. The police found the boy ____ on the subway and took him to the office. They bought him something to eat and asked him some questions. The boy's parents couldn't find him after arriving home. They felt ____ and called the police right away. They got to the police office and saw ____ son. They were very happy and thanked the police.

体育课上，小衢和小科进行爬楼梯比赛，从底楼开始爬上9米高的四楼。质量为70千克的小衢用了10秒，质量为60千克的小科用了9秒。小衢说：“我们都从底楼跑到四楼，我的体重比你大，我克服重力做的功比你多”；小科说：“我跑得比你快，我做功的功率比你大”。请通过分析计算说明他们的说法是否正确。