This silk has gone right ______ and we have not sold a single piece of it for weeks.

A．out of fad

B．out of pattern

C．out of custom

D．out of fashion

调查问卷中出现“你经常参加体育活动吗？”这样的问题，属于违背了表述问题的（）原则

A.通俗性

B.自愿性

C.准确性

D.客观性