Hello! I'm Linda. I have a good e-friend. Her name is Zhang Yun. Her English name is Betty. She is a Chinese girl, but she lives in the UK with her parents. Her father is a doctor and her mother is a teacher. She is ten years old. She call me big sister. She is good at English. She likes Chinese and I also like Chinese. She likes singing and playing basketball. This is my good e-friend. Do you want to know more?

据统计，2015年，深圳市出口无人机30.9亿元，比2014年猛增7.2倍。目前，深圳市有400多家单位从事无人机研发、生产和销售，占全球民用无人机市场的70%，已成为世界主要的民用无人机研发和生产基地。目前深圳已从中国全球3C（电脑、通讯、消费类电子）研发制造基地发展成为全球最主要的无人机生产基地。据此完成下列各题。