题干
How many people died in the Bund tragedy in Shanghai on Dec. 31, 2014?
A：21
B：36
C：300,000
答案(点此获取答案解析）
B
How many people died in the Bund tragedy in Shanghai on Dec. 31, 2014?
A：21
B：36
C：300,000
，这种烯烃有