青木香、广防己类药物中毒主要成分
A．虫蛀B．霉变C．酸败D．挥发E．沉淀
参考答案：D
浓度20%的糖水中，糖占糖水的多少？糖占水的多少？
You can see that ______ room is much bigger than ______. [ ]
A. our; their
B. ours; theirs
C. theirs; our
D. their; ours
