欢欢在中考前每天只吃：米饭、牛肉、蛋汤、大虾、鱼．为了使营养均衡，你觉得他最好还要吃（　　）

A．猪肉

B．河虾

C．青菜

D．牛奶

Harry Potter is so interesting a book that lots of teenagers like to read _____. [ ]

A. it

B. this

C. that

D. one