下列各数中,最小的数是( )
A:3﹣2
B:25
C:-17
D:2
Nobody knew who was the first ________ at school that morning when the window was broken.
关于艾弗里“肺炎双球菌转化实验”和“噬菌体侵染细菌实验”的叙述中,正确的是( )