右图反映了江南地区得到开发的哪一原因(    )

某研究小组为探究植物对空气中尘埃粒子有何影响，进行了以下实验；

①在甲乙两个相同的房间内，在甲房间内置入绿色植物10株，乙房间不放植物．

②同时向甲、乙两个房间内释放等量的较大颗粒物．制造有尘埃粒子空气环境．

③每隔1小时对甲、乙房间内空气中的尘埃粒子数进行检测

请分析回答：

   “Who needs a shopping mall if you have Taobao?" says Wang Lin, 28, a writer in Beijing. Taobao, China's largest online shopping site(网上购物网站), has become an important part of Wang Lin's life. She spends lots of money on Taobao.A growing number of Chinese Internet users like Wang have found the joys of online shopping =. Most online shoppers are students or young workers. More women shop on line than men. Clothing and home-use products（产品）are the most popular on line.
   It was reported that more than 250 billion（十亿）yuan was spent on online shopping last year, 80% through Taobao.Taobao means “looking for treasure” in Chinese. People can find almost everything they need on Taobao, from clothes to books =, from candies to DVD players .
   You may question the security of online shopping, Wang Lin said, "It's very safe and convenient. Unless you receive the products from the sellers and are satisfied with them, the shop owner will not get the money .You can also get your money back if you want to return the products.”