已知递增等差数列{a_n}中，a₁+a₂+a₃=9，a₁•a₂•a₃=15．（1）求数列{a_n}的通项公式；（2）求数列{a_n}的前10项和．

-How about your journey to Mount Emei?

-Everything was wonderful except that our car ________ twice on the way.[ ]

A．slowed down  

B．broke down

C．got down  

D．put down