具有清气分实热，退蒸功效的药物是（）
A.石膏
B.白薇
C.栀子
D.芦根
E.胡黄连
参考答案：B
If you_____this experiment you will understand the theory better.
A．will be doing
B．have done
C．will have done
D．would do
〈天工开物〉
