What is the most important factor for a rocket to escape from the Earth? When a bicycle "coasts" downhill, it ______.

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问题 What is the most important factor for a rocket to escape from the Earth?
When a bicycle "coasts" downhill, it ______.

选项 A、runs along the hillside
B、does not need any further power
C、runs freely to all directions
D、does not meet with air resistance

答案B

解析
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