在探究影响鼠妇分布的环境因素的实验中,所用鼠妇的数量最好为 ( )
A:1只
B:2只
C:10只
D:11只
Bob likes bread, ______ he doesn't always eat it.
一 interesting book! Where did you buy it?
一In the bookshop near our school.
激光产生于____.