A:①②③④
B:②④①③
C:④③②①
D:④②①③
麦哲伦船队探险航线经过的大洋依次是( )
What are good questions ______a conversation?
Did Mike have ______ accident when he was eight?( )
①把装置连接好
②两手紧贴容器外壁使容器内的空气受热膨胀
③观察导管口有无气泡冒出
④把导管的一端浸入水中.