题目内容
---Do you know second-hand smoke?
---To protect our health and memory.
A. how we should prevent B. why should we prevent
C. why we should prevent D. whether we should prevent
练习册系列答案
相关题目
题目内容
---Do you know second-hand smoke?
---To protect our health and memory.
A. how we should prevent B. why should we prevent
C. why we should prevent D. whether we should prevent