小淘气帮妈妈做家务,扫地要用5分钟,擦家具要8分钟,烧开水要15分钟,泡茶要1分钟,如果他合理安排,做完这些事至少要( )分钟.
A:29
B:30
C:15
D:16
What's this? It's a tiger.
已知:Sn+SnCl2=2SnCl4