题目

WeChat is a social mobile application with voice and text messaging timeline and several social features like ‘Message in a Bottle’. WeChat, a popular instant messaging tool run by Tencent Holdings, aims to help users access mobile services without downloading separate apps, which experts said may challenge the business of smartphone app distributors such Apple Store.This new feature, named ‘Mini Programs’, allows WeChat users to find a variety of services such as ticket buying by scanning a QR (quick-response) code, saving them the trouble of installing a number of different apps on s下列人类活动不利于人类与环境关系良性循环的是 [　　] A．澳大利亚墨累达令盆地的混合农业 B．洞庭湖畔围湖造田 C．我国西部牧区的轮牧 D．珠江三角洲地区的基塘农业