亚洲与非洲的分界线是（ ）
A．白令海峡
B．巴拿马运河
C．直布罗陀海峡
D．苏伊士运河
世界上亚洲和非洲的分界线是苏伊士运河．根据题意．
故选：D
- I came to your home yesterday afternoon, but nobody was in.
- Oh, we ________ some shopping in the supernarket. [ ]
A. have done
B. did
C. were doing
D. are doing
固态的凝集性气溶胶称为（）。
A.气体
B.蒸气
C.雾
D.烟
E.尘
