单选题
Which of the following is an example of inertia?
A、
A boat can stay on water.
B、
A plane can fly in the air.
C、
You can walk faster on a very smooth surface.
D、
You can go forward and backward on a swing.
【正确答案】
D
【答案解析】
[分析] 推断题型。 见第一段中的最后一句，因此选项D为答案。
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