【题目】Internet shopping is really ________ when people are sure of its safety.
A．setting up B．setting off
C．taking up D．taking off
在线课程【答案】D
【解析】
试题分析：A．set up建立，安装；B．set off 出发，启程；C．take up占用，继续；D．take off大受欢迎，迅速流行。句意：当人们确信网络购物的安全性之后，网购真的是大受欢迎。根据句意选D.