在下列情况中，物体可被看作质点的是（ ） A．研究运动员高台跳水时在空中的翻转动

Li Shizhen was born in 1518. His father was a poor doctor小题1:              He decided to study medicine so that he could help people who were ill.
Li Shizhen read many books about medicine. 小题2:            So he wished to write a new one.
小题3:                 He studied not only the herbs(草药) in his own garden, but also the wild ones. He always went on long journeys to collect herbs and talked with old peasants. 小题4:              
After many years of hard work and study, 小题5:                 At that time he was sixty. His book is now one of the greatest contributions of the Chinese people to the medical science of the world.

A. Li Shizhen often saw that people fell ill. B. But he found many of the old medical books were full of mistakes. C. He learned a lot from the working people. D. Li Shizhen finished his great work Ben Cao Gang Mu. E. He did his best to study medical science.