具有敛肺止咳、生津安蛔功效的药物是（）。
A.使君子
B.乌梅
C.槟榔
D.贯众
E.花椒
参考答案：B
Mr. Smith graduated from college at the age of 23, and ___________ he has been working as a teacher in a middle school.
A．after that
B．from then on
C．from then
D．since then
下列说法中正确的是（ ）
A．饱和溶液一定是浓溶液
B．析出晶体后的溶液一定是饱和溶液
C．饱和溶液降温后，一定有晶体析出
D．凡是均一、透明的液体一定是溶液
