教师劳动的特点包括（）
A．系统性
B．示范性
C．学习性
D．创造性
参考答案：B, D
．He thought she was a pretty girl_______poorly she was dressed.
A．how
B．as though
C．as long as
D．however
为什么我国要对畜禽实施强制免疫接种计划？
