题目：
跳伞运动员在空中张开降落伞后，会做一段速度不断减小的运动，在此过程中他的[ ]
A．动能减小，重力势能减小，机械能减小
B．动能减小，重力势能增大，机械能不变
C．动能减小，重力势能不变，机械能减小
D．动能不变，重力势能减小，机械能减小
答案：
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跳伞运动员在空中张开降落伞后，会做一段速度不断减小的运动，在此过程中他的[ ]
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