— Can you tell me________?
— He is in the library.
A:where was Jack
B:where Jack was
C:where is Jack
D:where Jack is
如图,数轴上A,B两点分别对应实数a,b,则下列结论正确的是( )
以下不能说明细胞全能性的实验是 ( )
我国未成年人保护法重在对不良行为、违反行为以及犯罪行为的预防和矫治。( )