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【多选题】
关于类胡萝卜素，下列说法正确的是：A.
类胡萝卜素是含 40 个碳的类异戊烯聚合物 , 即四萜化合物。
B.
类胡萝卜素属于脂溶性色素。
C.
类胡萝卜素对光、热、氧等非常敏感，易被氧化。
D.
类胡萝卜素可以帮助清除叶绿素捕获的多余的光能。
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举一反三
【单选题】Never before that night ______ the extent of my own power.
A.
had I left
B.
I left
C.
did I feel
D.
I had felt
【简答题】He used the power to i______ his belief on others.
【单选题】Never before that night ______ the extent of my own power.
A.
did I feel
B.
had I felt
C.
I had felt
D.
I did felt
【简答题】I think machine power is better than human power because we cannot survive without our daily used machines like bikes, coolers, computers, etc. Started on 14-Apr-2008 By Smith E-mail: rkssce...
【单选题】I believe that when the power of love overcomes the love of power， will there be peace in this world.
A.
until then
B.
only which
C.
so
D.
only then
【单选题】Never before that night ______ the extent of my own power.
A.
had I felt
B.
I had felt
C.
did I feel
D.
I did felt
【单选题】Never before that night ______ the extent of my own power.
A.
had I felt
B.
I had felt
C.
did I feel
D.
I did felt
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