单项选择题
A.If
B.As
C.May
D.Should
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单项选择题
A.culturalB.literateC.sensitiveD.sensible
A.cultural
B.literate
C.sensitive
D.sensible
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填空题
In chemical works there are many waste materials, most of which ______ (在物定情况下可以转化为有用的东西)
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