题目

The idea for a science experiment can come from an unusual place. After watching a YouTube video of a dancing bird named Snowball, a scientist in California decided to study the ability of animals to keep the beat. Bird lovers have long claimed that their pets have rhythm, and there are many videos of dancing birds online. Until now, scientists have suspected that humans are the only animals that can accurately keep rhythm with music. Thanks to Snowball, that scientific opinion is changing. Snowball is a cockatoo, a kind of parrot, and his favorite song is Everybody by the Backstreet Boys. Whe播到土壤里的种子不能萌发的原因是（ ）A．种子不完整B．胚已死亡C．呈休眠状态D．以上都有可能