⑴Where's your mum?
⑵Am I going to have a party?
⑶The balloon is flying away.
⑷The teacher can help me.
start:____ duck:____ soon:____
stay:____ mess:____
特殊的地理位置,独特的高寒气候区形成了富有特色的生产生活方式,下列现象中不属于该地区的是( )
某中学生按正常速度步行4km,所需时间大约是( )