根据首字母填空 these red apples are expensive,but those green ones are very c___.how i___ is the river?it's about 4,500 kilometres.

问题描述:

根据首字母填空 these red apples are expensive,but those green ones are very c___.
how i___ is the river?
it's about 4,500 kilometres.

cheap便宜的
long长的