下列属于热带草原景观的是（ ）
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（2016•全国）我国是世界闻名的陶瓷古国，明清时期，“瓷都”景德镇是全国的瓷业中心，产品远销海内外，20世纪80年代初，广东省佛山市率先引进国外现代化陶瓷生产线，逐步发展成为全国乃至世界最大的陶瓷生产基地。2003年，佛山陶瓷主产区被划入中心城区范围，陶瓷产业向景德镇等陶瓷产地转移。促使佛山陶瓷产业向外转移的主要原因是佛山（ ）
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．
杀虫剂往往初期灭虫效果显著，后来灭虫效果逐渐下降，其原因是（ ）
