指纹的这种吸引力，是其本身具有的特点决定的。这些特点是什么？
参考答案：
（一）人各不同
（二）终生基本不变
（三）触物留痕
（四）认定人身
句型转换，每空一词。
1. This is a picture of my family. (对画线部分提问)
_______ _______ ?
2. My backpack is on the sofa. (对画线部分提问)
_______ your _______?
3. Are those his keys? (改为单数形式)
_______ _______ his key?
4. Are his things on the bed? (作否定回答)
No, _______ _______.
5. I can take it to her. (改为一般疑问句)
_______ _______ take it to her?
It's（）novel I've ever read.
A.better
B.the best
C.good
D.best
