牡丹皮药材粉末可见晶体是（）
A.簇晶
B.方晶
C.砂晶
D.针晶
E.柱晶
参考答案：A
培训中需诱导学习者，使其产生正确的反应。
- Do you know_____________?
- Sorry, I don't know. You may ask the woman over there. [ ]
A. when the shop opens
B. when is the shop open
C. when does the shop open
D. when will the shop open
