问题
选择题
Food supplies may ________ towards the end of the trip, so we can’t waste any food.
A．run out
B．run up
C．run in
D．run away
答案
A
本题考查固定短语。run out“用光、花光”，无被动语态；run up“竖起，升起”； run in意为“顺便探访”；run away意为“逃跑”。故答案为A。