题目内容
On the train, you use your cell phone to call a co-worker about a meeting.
查看答案
搜索结果不匹配？点我反馈
更多问题
Without realizing it, you've left a trace of information easily accessible to others starting back at the subway station.
It doesn't matter because people you don't know don't have access to your information.
Your information can be divided into two categories—active and passive.
Your active data is the information about you that is being recorded without your knowledge.
微信支付 
支付宝支付