配方甲：在MS培养基中加入BA和NAA，质量浓度均为0.5mg/L；
配方乙：在MS培养基中加入BA和NAA，质量浓度分别为2～3mg/L和0.02一0.3mg/L；
配方丙：MS培养基各成分用量减半，并添加NAA，质量浓度为0.1mg/Lo
回答下列问题：
sun mountains birds river flowers what rainbow park clouds nice
This is a nature ____ .There is a ____ and some ____ in the sky.There are two ____ flying in the sky.Look! There is a beautiful ____ between the two ____ .There is a long ____ on the grass.There are some ____ on the grass. ____ a ____ picture it is!
