WHO龋病流行程度属低的标准是
A．0.0～1.1
B．1.2～2.6
C．0.5～1.5
D．1.5～2.5
E．2.7～4.4
参考答案：B
—Let's play soccer.
—_______. Let's play ping-pong. [ ]
A. That's great.
B. That sounds good.
C. That's boring.
D. Yes, I do.
确定传染病的隔离期的重要依据是（）
A.潜伏期
B.传染期
C.前驱期
D.症状明显期
E.恢复期
