请根据李梅一家人的具体介绍，为他们选择合适的节目。

小题1: Li Mei’s grandfather is 75 years old. He knows a lot about Chinese history. He is a fan of Beijing Opera and he has a big collection of Chinese paintings. 　　

小题2: Li Mei’s grandmother is not very strong, so she keeps exercising with other old people every day. And she never misses watching programs about health.  　　

小题3: Li Mei’s father is an engineer in a computer company. He is really busy every day, but he always tries to make time for basketball and football. 　　

小题4: Li Mei’s mother is a housewife. She spends most of her time on the housework. And she often makes something delicious and special for her family.  　　

小题5: Li Mei is a middle school student. She studies hard, but she is under too much pressure. She has many problems like most teenagers do. 　　

当食物富含维生素C时，实验动物铁吸收率明显增加。与维生素C促进铁吸收机制无关的是

A．促进铁的还原
B．促进铁的氧化
C．防止离子铁沉淀
D．与铁形成小分子物
E．促进三价铁转化为二价铁