皮瓣包括（）
A.皮肤表层
B.皮肤全层
C.皮肤全层及部分皮下脂肪
D.皮肤全层及皮下组织
E.皮肤全层、皮下组织及肌肉
参考答案：D
词形转换。
1. Remember not to take other's things without _ _ (permit).
2. Your mother looks very _ (worry). What's wrong with her?
3. My brother likes reading very much, so he is _ (know).
4. There are about two _ _ (million) people in that city.
5. My sister is studying in a _ _ (medicine) college.
设计实验鉴别下列物质(操作.现象.结论)：
(1)水和酒精利用物理性质鉴别：_________________________
利用化学性质鉴别：_____________________________________
(2)氧气和二氧化碳：_________________________________。
