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【单选题】
甾体皂苷以少量醋酐溶解，然后加入醋酐浓硫酸，反应液最后呈现（）A.
绿色，后逐渐褪色
B.
黑色，后逐渐褪色
C.
红色，后逐渐褪色
D.
橙色，后逐渐褪色
E.
黄色，后逐渐褪色
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举一反三
【单选题】The lady said she would buy a gift for her daughter with the _____. [ ]
A.
20 dollars remained
B.
20 dollars to remain
C.
remained 20 dollars
D.
remaining 20 dollars
【单选题】Despite our efforts to persuade her,she remained bitterly________ to making a presentation to the class. [ ]
A.
object
B.
opposed
C.
accustomed
D.
disagreed
【单选题】She wanted to use the ____money to buy her husband a present for the coming Christmas. [ ]
A.
remained
B.
remaining
C.
leaving
D.
left
【单选题】She remained ______ for a while after the movie ended, which made others ______.
A.
sitting; puzzling
B.
sitted; puzzled
C.
seated; puzzled
D.
seated; puzzling
【单选题】She remained _____ for a while after the movie ended, which made others _____. [ ]
A.
sitting; puzzling
B.
sat; puzzled
C.
seated; puzzled
D.
seated; puzzling
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