We don't want to speak badly or ______ in front of the class.
A:clearly
B:carefully
C:carelessly
D:properly
骑自行车经过一个有交通信号灯控制的路口时,遇红灯亮,骑车人正确的行为是 ( )
用一定量的甲状腺激素连续饲喂正常成年小白鼠4周,与对照组比较,实验组小白鼠表现为( )