—I think middle school students can go out alone at night.

—__________. It’s dangerous for them to go out alone.

A．I hope so

B．I’m afraid so

C．So do I

D．I don’t think so

在流行病学调查中，由于失访所导致的偏倚属于：（）。

A.测量偏倚

B.检出偏倚

C.选择偏倚

D.信息偏倚