A:{x|0<x<1}
B:{x|﹣1≤x≤2}
C:{x|﹣1<x<2}
D:{x|0≤x≤1}
Nowadays, cycling, along with jogging and swimming, _______ as one of the best all-round forms of exercise.
地球赤道周长是4万千米,如果一飞行器以1000千米/小时的速度沿赤道近地面上空飞行一周,约需( )