What's more ,bicycles are environmentally friendly than cars,though they hardly make noises.改错.
问题描述：
What's more ,bicycles are environmentally friendly than cars,though they hardly make noises.改错.
答
What's more ,bicycles are environmentally （more）friendly than cars,though they hardly make noises.
答
What's more ,bicycles are (加上more)environmentally friendly than cars,though(改为and) they hardly make noises.改错.