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【单选题】
下列成分在多数情况下均为有效成分,除了( )
A.
皂苷
B.
氨基酸
C.
蒽醌
D.
鞣质
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A.
互易率失效
B.
曝光过度
C.
曝光不足
D.
眩光
【单选题】具有“花环型”结构的植物是( )。
A.
C 4 植物
B.
C 5 植物
C.
CAM植物
D.
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【单选题】—We haven’t heard from Jane for a long time . — What do you suppose to her?
A.
. was happening    
B.
. tohappen  
C.
. has happened   
D.
. having happened
【简答题】“花环型”结构
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