下列溶液中可以盛放在玻璃瓶中,但不能用磨口玻璃塞的是( )
A:硅酸钠溶液
B:氢氟酸
C:蔗糖溶液
D:氯化钠溶液
When you can't hear clearly. What should you say? __________
It takes us ________ hour to go there by ________ bus.