题目

If you are travelling         the customs are really foreign to your own , please do as the Romans do .A. in which            B. there                 C. when                      D. where 答案：D人体不能同时进行的生理活动是（ ）A．生长和发育B．消化和吸收C．吞咽和呼吸D．呼吸和心跳