题干
—Travelling by plane is more and more popular.
—So it is. But it is expensive. It more than going by train.
A：takes
B：costs
C：spends
D：pays
答案(点此获取答案解析）
B
表示图上1厘米的线段相当于实际距离( )千米，改写成数值比例尺是( )。
