冬葵子
参考答案：
来源于锦葵科科植物化冬葵的种子
Unfortunately, when I dropped in, Doctor Li _____ for Beijing to join in the fight again H1N1, so we only had time for a few words.
A．just left
B．has just left
C．is just leaving
D．was just leaving
井下作业地点的温度不得超过多少？
