牛膝主含
A.三萜皂苷 B.甾体皂苷C.黄酮 D.蒽醌E.生物碱
参考答案:A
— What did you buy for your daughter at the supermarket?
— I bought _____, because I couldn't find _____ she likes. [ ]
A. something; anything
B. anything; something
C. nothing; anything
D. something; nothing
思维的最大特征是()
A.逻辑性和层次性
B.抽象性和综合性
C.概括性和间接性
D.比较性和判断性
E.分析性和证明性