下列对脊椎动物特征的描述，错误的是（   ）

    Can you imagine a pair of shoes that could tie themselves? All you would have to do is to put them on and push a button. Well, this idea is becoming a real reality. The shoe company Nike created the self-tying shoe! This idea first came from the movie Back to the Future II, Nike has been working for years to create a shoe that can do this in real life. They have finally done it with Nike HyperAdapt 1.0.

    So how do they work? According to Nike, the shoe is “powered by an underfoot-lacing mechanism (脚下系带装置)”. This is kind of like a small motor (发动机) that has the power to lace the shoes. All the wearer has to do is to put them on, and at first, the shoes are very loose (松的). But then you can push the “+” button (按钮), and the shoes will tighten to be the perfect fit for the wearer. To take them off, all you have to do is to push the “－” button, and the shoes will be easily off.

    They haven't been released to the public yet, and the cost of the shoes is still unknown. But you might be able to get a pair of your own closer to the holiday season this year.

材料一 在汶川大地震中，涌现出许许多多呵护生命的感人故事。
一个叫邓清清的七年级女生被救援人员救出时,居然还在废墟里面打着手电筒看书，她在一片漆黑的废墟下忍受着寒冷饥饿，依靠看书缓解心中的恐惧，维持着自己微弱的生命。七年级女生何翠青被埋废墟50个小时后，凭着自己巨大的求生欲望和惊人的毅力，地救援人员的帮助下生还……。
材料二 汶川大地震发生后，无数的无名英雄投身到抗震救灾一线，美丽的白衣天使精心呵护着震区伤员；解放军冒死抢救废墟下地灾民；全国各地的志愿者积极赶赴灾区参与抗震救灾……。
请回答：