【单选题】The chair looks rather hard, but in fact it's very comfortable .
【单选题】The chair looks very old,but it is very comfortable to_____.
【单选题】The chair looks very old, I want a new one _________ .
【单选题】The chair looks very old, but in fact it is very comfortable to _____. [ ]
【单选题】The chair looks rather hard but in fact it is very comfortable.
【多选题】导柱结构长度按照功能不同分为三段( [填空(1)] )、( [填空(2)] )、( [填空(3)] )。