核酸的紫外吸收特性来自（）
A.脱氧核糖
B.核糖
C.嘌呤嘧啶碱基
D.磷酸二酯键
E.磷酸核糖
参考答案：C
用besides, except与except for完成句子
1. I like this room____the wall paper.
2. His report is correct____ that some details are omitted.
3. I have two other books____this one.
断肢再植术术后第2周可进行（）.
A.抗阻运动
B.手的灵巧性练习
C.脱敏训练
D.助力运动
E.被动运动
