一 Hi, Diana, how was your summer holiday?
一 ! I enjoyed myself in the sea very much.
A:Good idea
B:Wait a minute
C:That's too had
D:Pretty good
培养皿
操作1
操作2
操作3
现象
①
在一层浸水的棉花上放等量的绿豆种子若干
在25℃光照环境下培养
定时适量喷水,连续观察两周
无种子萌发
②
在25℃黑暗环境下培养
出现上述现象的原因最可能是( )