With help from all parts of the country, the people in the flooded area managed to _______ that harsh winter.

A．get through

B．look through

C．come up

D．get out

小青要给李老师打电话，但一时忘了电话号码，只记得电话是8236* 721。小青随意拨打，恰好拨通的可能性是（    ）。