书院是中国传统文化的产物，起于唐，盛于宋。宋初中国四大书院中属于湖南的有（   ）
①岳麓书院  ②白鹿洞书院  ③石鼓书院  ④嵩阳书院                    

    Charlie Chaplin was considered to be one of the most popular ____ (star) in the early days of films. He brightened the lives of people throughout the world ____ (use) his perfect acting.

    Charlie was born in a poor family and lived ____ hard life in his childhood. His parents were both poor hall performers,____ didn't make much money. Therefore, at a very young age, Charlie had to learn ____(sing) and dance. By his teens, his subtle acting had become so entertaining____ no one in England was ever bored watching him mime and act the fool doing ordinary everyday tasks. In 1972, he won a special Oscar ____ his outstanding work in the films that he wrote, directed, produced, and starred in. He made people laugh even when they felt depressed. And no one has done ____ (well) than him up to now.

    Charlie lived in England and the USA but ____(spend) his last years in Switzerland, where he died of ____ (nature) causes on December 25, 1977.

如果父母双方的基因组成都是Aa，他们所产生的生殖细胞就有两种，一种是含有基因____ 的，另一种是含有基因____ 的。受精卵的基因组成就有三种可能____ 、____ 、____ 。