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【多选题】
区别三萜皂苷和甾体皂苷的方法有A.
泡沫反应
B.
三氯甲烷-浓硫酸反应
C.
溶血试验
D.
三氯乙酸反应
E.
醋酐-浓硫酸反应
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举一反三
【单选题】Ordinary woman though she is, she has won the award because she tries every means to make people _______ of the importance of the environment conservation. [ ]
A.
aware
B.
careful
C.
sensible
D.
ambitious
【单选题】Mary has a curious expression on her face as though she ______ about something.
A.
is smiling
B.
were smiling
C.
smiles
D.
has smiled
【单选题】Though she has been in England for half a year, she is still unable to _____ in simple English. [ ]
A.
explain herself
B.
express herself
C.
speak her mind
D.
make herself understand
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