关于物体的惯性，下列说法中正确的是（　　）

在我国“三星堆遗址”的出土文物中，发现了用极薄的金箔贴饰的精美“金器”．黄金之所以能被做成极薄的金箔，主要是因为黄金具有（   ）

  The Dress That Turns into a Coca Cola Machine 

    This specially designed dress looks like a normal dress，but if you unfold it and cover yourself，you may look like a Coca Cola vending machine（自动售货机）. Because there are many vending machines like that on the street，it must be easy for you to hide．If you feel that someone is following you or there is some danger，you can disappear within five seconds．But don't use it to scare your classmates．That'll be rude.
                                  

    The M-Dress is a nice black dress．It is also a mobile phone．It accepts a standard SIM card and allows the wearer to receive calls without carrying an actual(真实的) phone in their pocket or purse．You just need to bring your hand to your ear when you want to answer a phone call．When you finish talking and release your hand，the call will close．It is fashionable and useful．But it will certainly be an embarrassing moment when your dress rings in public．
  Air Conditioned Jackets 

    You will love these air-cooled jackets in summer time when it is very hot outdoors．The jacket has fans that draw air in．The fan is powered by an inside battery．Now it is possible to spend nearly every second of your day with cool air．

已知x＞y＞0，则（   ）

2004年以来，全国文化产业年均增长速度在15%以上，比同期GDP增速高6个百分点。2010年文化产业增加值突破1万亿元，占GDP比重由2004年2.1%增加到2.5%以上；北京、广东等许多省市，文化产业增长速度年均超过20%，占GDP的比重均达到5%以上，成为当地新的支柱柱产业。这说明
①文化逐步对经济起决定作用
②文化成为综合国力竞争的物质基础
③文化产业对国民经济增长的贡献不断上升 
④文化产业逐步成为新的经济增长点