— Would you like __________?
A:to try it on
B:to try them on
C:trying them on
D:try it on
血管在体循环和肺循环中流动的共同规律是( )
小强经常皮下、牙龈出血,他应多吃下列哪种食物最好( )
氢气球吊着一个重物,以10m/s的速度匀速上升,当到达某一高度,绳子突然断开时,这个重物将( )