题干
When you talk, you have to at least make yourself .
A：follow
B：followed
C：following
D：being followed.
答案(点此获取答案解析）
B
>m
，甲自由下落1秒后从同一地点再释放乙，如果以乙为参考点，则在它们落地之前，甲的运动状态是( )