A:进行气体交换
B:气体进出的通道
C:保证气体顺畅通过
D:使进入肺内的气体温暖、湿润、清洁
某海岛屿由海底火上喷发形成,岛上植被茂盛,景色宜人,正逐渐成为旅游胜地.下列叙述错误的是( )
①方程f(x)=﹣x有____个根;
②若方程f(x)=ax恰有两个不同实数根,则实数a的取值范围是____.
----The new street is so clean. _______ the way, do you enjoy living here? ----Of course I do. Life has become much better _______ many ways.