2. 外语
  3. Choose THREE letters, A-E The invention of different gears on a bicycle affected which THREE of the following? A Wheel size B Ba

Choose THREE letters, A-E The invention of different gears on a bicycle affected which THREE of the following? A Wheel size B Ba

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问题 Choose THREE letters, A-E
The invention of different gears on a bicycle affected which THREE of the following?
A Wheel size
B Balance
C Rate of speed
D The back wheel
E Safety
F Downhill travel
选项
答案D
解析
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