问题
单项选择题
某航母跑道长200m，飞机在航母上滑行的最大加速度为6m/s²，起飞需要的最低速度为50m/s.那么，飞机在滑行前，需要借助弹射系统获得的最小初速度为（）
A.5m/s
B.10m/s
C.15m/s
D.20m/s
答案
参考答案：B
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某航母跑道长200m，飞机在航母上滑行的最大加速度为6m/s²，起飞需要的最低速度为50m/s.那么，飞机在滑行前，需要借助弹射系统获得的最小初速度为（）
A.5m/s
B.10m/s
C.15m/s
D.20m/s
参考答案：B
Passage Two
Which of the following is true according to what you’ve just heard
A．His horse flew over the treetops below.
B．His horse nearly fell into the deep valley.
C．His horse raced across the valley easily.
D．His horse refused to carry him over the hilltop.