每100克牛奶中含脂肪4克，每100克花生米中含脂肪39.2克，花生米中的脂肪含量是牛奶的10倍

一棵紫露草在一个加入肥料和水的玻璃瓶里被密封了40年之后，依然长势旺盛。对于这一神奇现象。园艺专家指出，尽管与外界新鲜空气和水分隔绝，但密封的瓶子创造了自己的微型生态系统；紫露草利用光合作用产生氧气和水分，掉落在瓶底的叶子产生二氧化碳为光合作用提供必要条件，并且给植物根部提供养分。由此，我们可以看出（   ）。

①与人相比，植物在适应环境变化发面更具有主动创造性

②植物通过自己否定自己，自己发展自己，实现了自身的回归

③植物的生存与发展是绝对运动和相对静止的有机统一

④植物微型生态系统内部诸要素基于固有联系按一定方向发生作用

    Jackie Chan is one of the most popular TV and film stars, not only in China but also in the world.He was born in 1, on April 7^th, 1954.His parents left Mainland of China 2 Hong Kong a short time before he was born.His parents named him “Chan Kong-sang”, which 3 born in Hong Kong.They wanted to celebrate a 4 trip to Hong Kong.

    At first, Jackie's family 5 in the French Embassy(大使馆).His father worked as a cook, and his mother was a housekeeper.They were not very rich.Then Jackie was seven years old, his family 6 to Australia.There his father 7 a job in the American Embassy.Later, they went back to Hong Kong.Jackie's father 8 him to the China Drama Academy.But he couldn't give his son enough 9 .Jackie had to do some part-time 10 after school.He studied and 11 for 19 hours a day.The students 12 Kungfu and learned how to do many stunts there.

    When Jackie was only 17, he began to do 13 stunts for films.In the early 1980s, Jackie went to Hollywood, 14 he wasn't very successful.He went on to act in films in Hong Kong and had great 15.Finally in 1995, Jackie Chan became famous in the United States.Today, Jackie Chan has both Chinese and American fans, and he earns millions of dollars from his films.

设随机变量X的分布列为$P\left(X=i\right)=\frac{i}{2a},i=1,2,3$，则$P\left(X=2\right)=$（   ）