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【单选题】
分离麻黄碱与伪麻黄碱是利用两种生物碱的( )差异进行分离的
A.
极性的差异
B.
水溶性的差异
C.
碱性的差异
D.
挥发性的差异
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A.
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B.
Pumpkins are heavy, even for s.
C.
Because it ’ s easy for them to fall down.
D.
No child should go trick-or-treating alone.
E.
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F.
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The following tips can ensure kids ’ safety this Halloween season.
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B.
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C.
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D.
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B.
Pumpkins are heavy, even for s.
C.
Because it ’ s easy for them to fall down.
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Too small costumes make your kids look strange.
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The following tips can ensure kids ’ safety this Halloween season.
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A.
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has locked
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Because it ’ s easy for them to fall down.
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【单选题】She was quite sure that she ________ the door before she left the office
A.
would lock
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