如图所示，长为R的轻杆一端拴有一个小球，另一端连在光滑的固定轴O上，现在最低点给小球一水平初速度，使小球能在竖直平面内做完整圆周运动，不计空气阻力，则（   ）

材料二：党的十八大报告提出，根据我国经济社会发展实际，要在2020年，实现国内生产总值和城乡居民人均收入比2010年翻一番。全面实现建设小康社会的宏伟目标，提高人民的消费和生活水平，通过扩大内需和转变经济发展方式带动我国经济又好又快发展，从而体现社会主义的本质要求和实现社会主义市场经济的根本目标。

请运用《经济生活》相关知识，根据建设“美丽中国”的目标，请你从消费者个人、企业生产经营者和国家的角度来谈谈应该怎么做？

    Mrs White is a housewife. She is always busy in the morning. She gets up early and cooks breakfast. She has two children, Leo and May. Leo is ten years old and May is eight years old. They get up at seven o'clock. Leo makes his bed and washes quickly. May does not make her bed. Her bedroom is often messy. After breakfast, Mrs White takes them to school by car. Then, she goes to the supermarket and buys food for dinner.

    One day, Mr White has a meeting in the office. He does not come home for dinner. Mrs White is busy in the kitchen. Leo and May are waiting for dinner at the table. Leo says:” Dad isn't at home. I'm the head of our family today. I can sit on Dad's chair.” May says,” You should sit on Mum's chair.”