下列那种数据源是在调查者知情的情况下收集数据信息的方法（）。
A.网络跟踪器
B.电子邮件
C.商业广告
D.网上问卷调查
参考答案：D
— Why couldn't you tell me how you felt about things?
— That's because I grew up in a family _______ we didn't talk about feelings. [ ]
A. where
B. which
C. when
D. why
企业与其在未来发生的交易和事项不形成资产。 （ ）
