需要烊化的药物是（）
A.蒲黄
B.鹿角胶
C.钩藤
D.沉香
E.鱼腥草
参考答案：B
近似数3. 40万，精确到的位数和有效数字的个数分别是[ ]
A. 百位，3个
B. 百分位，3个
C. 千位，3个
D. 千位，5个
We firmly believe that war never settles anything. It only _____ violence. [ ]
A. runs into
B. comes from
C. leads to
D. begins with
